<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Lei,<div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>AFAIK, the Chimera .gro reader treats all atom records the same, so I would be somewhat surprised if it actually identified a CL as chlorine ever. Do you have an example file?</div><div class=""><br class=""></div><div class="">--Eric<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Feb 26, 2021, at 7:53 PM, Lei Qian <<a href="mailto:leiqian-temple2@outlook.com" class="">leiqian-temple2@outlook.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">Hi Eric,</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">Thank you very much for your thorough explanation! I really appreciate it.</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class=""><br class=""></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">I tried to do some test. I found:</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">Chimera recognizes CL when CL shown as solvent in gro file:</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">1000CL CL2000 x.xxx x.xxx x.xxx</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">But it cannot recognize CL when CL shown as "LIG" in gro file:</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class=""><span style="background-color: rgb(255, 255, 255); display: inline !important;" class="">1000LIG CL2000 x.xxx x.xxx x.xxx</span><br class=""></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class=""><span style="background-color: rgb(255, 255, 255); display: inline !important;" class="">And in LIG case, "Cl" or "CL" may not have much difference.</span></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class=""><span style="background-color: rgb(255, 255, 255); display: inline !important;" class=""><br class=""></span></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class=""><span style="background-color: rgb(255, 255, 255); display: inline !important;" class="">Thanks again for your kind reply!</span></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">Best,</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">Lei</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class=""><span style="background-color: rgb(255, 255, 255); display: inline !important;" class=""><br class=""></span></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class=""><span style="background-color: rgb(255, 255, 255); display: inline !important;" class=""><br class=""></span></div><div id="appendonsend" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""></div><hr tabindex="-1" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline-block; width: 497.828125px;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""></span><div id="divRplyFwdMsg" dir="ltr" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>Eric Pettersen <<a href="mailto:pett@cgl.ucsf.edu" class="">pett@cgl.ucsf.edu</a>><br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>Tuesday, February 23, 2021 5:04 AM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>Lei Qian <<a href="mailto:tuk04130@temple.edu" class="">tuk04130@temple.edu</a>><br class=""><b class="">Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:chimera-users@cgl.ucsf.edu" class="">chimera-users@cgl.ucsf.edu</a> BB <<a href="mailto:chimera-users@cgl.ucsf.edu" class="">chimera-users@cgl.ucsf.edu</a>><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>[External] Re: [Chimera-users] in *.gro file, chimera takes CL atom as C (in compound) and gives it wrong color</font><div class=""> </div></div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; line-break: after-white-space;">Hi Lei,<div class=""><span class="x_Apple-tab-span" style="white-space: pre;"></span>There is no explicit indication of the chemical element type in a .gro file, so it's all guesswork. Chimera assumes that atom names that begin with any of the letters C, O, P, S, H, or N are the corresponding single letter element type. This prevents atom names like CA and HG from being interpreted as calcium and mercury, rather than carbon and hydrogen.</div><div class=""><span class="x_Apple-tab-span" style="white-space: pre;"></span>There aren't any great solutions. One option is to read in the .gro file, write it out as a .mol2 file, then edit that file to change the atom type of the CL atoms to Cl, then read that back in. Another is to select your CL atoms and use the "Modify Structure" tab of the Build Structure tool to change their element to Cl.</div><div class=""><br class=""></div><div class=""><div class="">--Eric</div><div class=""><br class=""></div><div class=""><span class="x_Apple-tab-span" style="white-space: pre;"></span>Eric Pettersen</div><div class=""><span class="x_Apple-tab-span" style="white-space: pre;"></span>UCSF Computer Graphics Lab</div><div class=""><br class=""></div><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Feb 18, 2021, at 8:30 PM, Lei Qian <<a href="mailto:tuk04130@temple.edu" class="">tuk04130@temple.edu</a>> wrote:</div><br class="x_Apple-interchange-newline"><div class=""><div dir="ltr" class="">Dear users,<div class="">Could I ask a question on chimera? Thanks!</div><div class="">I tried to open a gro file (small compound) using chimera. Like below:</div><div class="">... ...</div><div class=""><span class="" style="font-family: Tahoma, Arial, STHeiti, SimSun; font-size: 14px;"> </span><font face="tahoma, sans-serif" class=""><span class="" style="font-size: 14px;"><span class="Apple-converted-space"> </span> 1 LIG CL 18 x.xxx </span><span class="Apple-converted-space"> </span>x.xxx <span class="" style="font-size: 14px;"> </span><span class="Apple-converted-space"> </span>x.xxx <br class="" style="font-size: 14px;"><span class="" style="font-size: 14px;"> 1 LIG CL1 19 </span>x.xxx <span class="" style="font-size: 14px;"> <span class="Apple-converted-space"> </span></span>x.xxx <span class="" style="font-size: 14px;"> </span><span class="Apple-converted-space"> </span>x.xxx </font><br class=""></div><div class="">... ...</div><div class="">Although chimera shows the CL name "CL" when the cursor is above the atom, but the CL atom color is incorrect: the same as Carbon. </div><div class="">I tried to change the "CL" to "BR", and the chimera shows the correct color: dark red. It seems weird to me. Could you please give me any suggestions? </div><div class="">Thanks!</div><div class="">Best,</div><div class="">Lei</div><div class=""><br class=""></div><div class=""><br class=""></div></div>_______________________________________________<br class="">Chimera-users mailing list:<span class="Apple-converted-space"> </span><a href="mailto:Chimera-users@cgl.ucsf.edu" class="">Chimera-users@cgl.ucsf.edu</a><br class="">Manage subscription:<span class="Apple-converted-space"> </span><a href="https://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users" class="">https://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users</a><br class=""></div></blockquote></div><br class=""></div></div><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Chimera-users mailing list:<span class="Apple-converted-space"> </span></span><a href="mailto:Chimera-users@cgl.ucsf.edu" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">Chimera-users@cgl.ucsf.edu</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Manage subscription:<span class="Apple-converted-space"> </span></span><a href="https://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users</a></div></blockquote></div><br class=""></div></body></html>