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Featured Citations

Quantum spin resonance in engineered proteins for multimodal sensing. Abrahams G, Štuhec A et al. Nature. 2026 Jan 29;649(8099):1172–1179.

RNA-triggered Cas12a3 cleaves tRNA tails to execute bacterial immunity. Dmytrenko O, Yuan B et al. Nature. 2026 Jan 29;649(8099):1312–1321.

Multiple protein structure alignment at scale with FoldMason. Gilchrist CLM, Mirdita M, Steinegger M. Science. 2026 Jan 29;391(6784):485-488.

An ATP-gated molecular switch orchestrates human mRNA export. Hohmann U, Graf M et al. Nature. 2026 Jan 22;649(8098):1042–1050.

ZAK activation at the collided ribosome. Huso VL, Niu S et al. Nature. 2026 Jan 22;649(8098):1051–1060.

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News

December 25, 2025

computer generated image
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

man and molecule

Virtual Reality

ChimeraX virtual reality works with HTC Vive, Oculus Rift, and Samsung Odyssey systems (those supported by SteamVR). Any structures, maps, etc. that can be displayed in ChimeraX can be viewed in the headset and manipulated with the hand controllers. Icon toolbars visible in the headset allow changing the scene display or hand-controller button assignments with a single click. Besides rotation, translation, and zooming, useful functions include labeling, distance measurement, bond rotation, placing markers into a map, and changing map contour levels. Virtual-reality (VR) mode can be turned on and off with the vr command, and the meeting command allows multiple users to share a single session in VR.

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Example Image

cyclodextrin pore

Cyclodextrin Pore

The outer-membrane protein CymA admits bulky molecules into the periplasmic space of Klebsiella oxytoca. Here, CymA (PDB 4d5d chain A) is depicted in a style reminiscent of a diagnostic X-ray, with transparent molecular surface and β-strand “ribs” in white. The protein has ingested α-cyclodextrin (top) and β-cyclodextrin (bottom), bound at the entry site and near the exit, respectively. Cyclodextrin carbon atoms are shown in blue-gray and oxygen atoms in brick red. For image setup, see the command file xray.cxc.

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