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The molecular basis of force selectivity by PIEZO2. Mulhall EM, Yarishkin O et al. Nature. 2026 May 7;653(8113):297–305.

Human DHX29 detects nonoptimal codon usage to regulate mRNA stability. Hia F, Wu Y et al. Science. 2026 May 7;392(6798):eadw0288.

CSN5i-3 is an orthosteric molecular glue inhibitor of COP9 signalosome. Shi H, Wang X et al. Nature. 2026 Apr 30;652(8112):1375–1383.

Selective targeting of endothelial and perivascular angiocrine ROCK2 treats liver fibrosis. Hu Y, Yang B et al. Cell. 2026 Apr 30;189(9):2663-2683.e26.

Complement inhibition by a unique cluster of immunomodulatory outer surface proteins of Borrelia recurrentis. Röttgerding F, Reyer F et al. Nat Commun. 2026 Apr 29;17(1):3900.

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December 25, 2025

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The RBVI wishes you a safe and happy holiday season! See our 2025 card and the gallery of previous cards back to 1985.

September 22, 2025

Mac users may wish to defer upgrading to MacOS Tahoe. Currently on that OS the Chimera graphics window is shifted so that it covers the command and status lines.

March 6, 2025

Chimera production release 1.19 is now available, fixing the ability to fetch structures from the PDB (1.19 release notes).

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Please note that UCSF Chimera is legacy software that is no longer being developed or supported. Users are strongly encouraged to try UCSF ChimeraX, which is under active development.
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UCSF Chimera is a program for the interactive visualization and analysis of molecular structures and related data, including density maps, trajectories, and sequence alignments. It is available free of charge for noncommercial use. Commercial users, please see Chimera commercial licensing.

We encourage Chimera users to try ChimeraX for much better performance with large structures, as well as other major advantages and completely new features in addition to nearly all the capabilities of Chimera (details...).

Chimera is no longer under active development. Chimera development was supported by a grant from the National Institutes of Health (P41-GM103311) that ended in 2018.

Feature Highlight

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Radial Coloring

A surface can be colored radially, that is, by distance from a user-specified point. Additional options include coloring by distance from an axis or a plane. Different coloring schemes can be applied.

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Gallery Sample

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p53 Cancer Mutations

Mutations that inactivate the tumor suppressor p53 are found in over 50% of human cancers, and most of the cancer-associated mutations are within its DNA-binding domain. The image shows a tetramer of the p53 DNA-binding domain complexed with DNA (Protein Data Bank entry 2ac0). The tetramer subunits are shown as light blue, green, orange, and yellow ribbons, with red spheres marking several major "hot spots" of mutation. The DNA is shown in purple and blue. (More samples...)


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