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Featured Citations

Termination of the integrated stress response. De Miguel C, Thorkelsson SR et al. Science. 2026 Feb 19;397(6787):eadw5137.

Bacteria deliver a microtubule-binding protein into mammalian cells to promote colonization. Costello MS, Neumann B et al. Science. 2026 Feb 19;391(6787):825-830.

Ribosomal RNA expansion segments mediate the oligomerization of inactive animal ribosomes. Schwarz A, Mueller M et al. Science. 2026 Feb 19;391(6787):eadr4287.

Causal modelling of gene effects from regulators to programs to traits. Ota M, Spence JP et al. Nature. 2026 Feb 12;650(8101):399–408.

Recruitment of bifunctional regulator thermospermine to methylated ribosomes directs xylem fate. Ko D, Ruonala R et al. Science. 2026 Feb 12;391(6786):694-699.

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News

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.

December 16, 2025

The ChimeraX 1.11 production release is available! See the change log for what's new.

November 21, 2025

The ChimeraX 1.11 release candidate is available – please try it and report any issues. See the change log for what's new. This will be the last release to support Red Hat Enterprise Linux 8 and its derivatives.

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UCSF ChimeraX

UCSF ChimeraX (or simply ChimeraX) is the next-generation molecular visualization program from the Resource for Biocomputing, Visualization, and Informatics (RBVI), following UCSF Chimera. ChimeraX can be downloaded free of charge for academic, government, nonprofit, and personal use. Commercial users, please see ChimeraX commercial licensing.

ChimeraX is developed with support from National Institutes of Health R01-GM129325.

Bluesky logo ChimeraX on Bluesky: @chimerax.ucsf.edu

Feature Highlight

multichannel 3D image of hiPSCs from AICS

Multichannel Light Microscopy

3D images and time series from multichannel optical microscopy are shown in the Volume Viewer tool, with easy access to hiding/showing individual channels, changing their colors, and adjusting threshold levels with the mouse. The menu of style options includes “volume” (translucent blobs, as in the image), surface, mesh, maximum intensity projection, single plane, and orthoplanes. For convenience, the step size, region bounds, and display style of different channels of the same dataset are coupled, in that changing the setting of one channel automatically changes it for the others.

The image shows human induced pluripotent stem cells, with plasma membrane in violet red, EGFP-tagged fibrillarin (as a marker for nucleolus) in yellow, and DNA (nucleus) in turquoise. The data are publicly available from the Allen Cell Explorer website, dataset: AICS-14_0.

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Example Image

potassium channel

Potassium Channel-Calmodulin Complex

KCNQ1 is the pore-forming subunit of a cardiac potassium channel. It binds to calmodulin, and mutations in either of these proteins can cause congenital long QT syndrome, a dangerous propensity for irregular heartbeats. In the image, a structure of the KCNQ1/calmodulin complex (PDB 5vms) has been assembled into the native tetrameric form with the sym command. The view is from the cytoplasmic side, with KCNQ1 shown as surfaces, calmodulin as cartoons, and calcium ions as balls. A pastel palette from ColorBrewer has been used to color the surfaces, darkened with color modify for the cartoons, and “rotated” 45° in hue for the ions. See the command file colormod.cxc.

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