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Cryo-EM structure of the vaccinia virus entry fusion complex reveals a multicomponent fusion machinery. Lin CS, Li CA et al. Sci Adv. 2026 Jan 16;12(3):eaec0254.

Toward community-driven visual proteomics with large-scale cryo-electron tomography of Chlamydomonas reinhardtii. Kelley R, Khavnekar S et al. Mol Cell. 2026 Jan 8;86(1):213-230.e7.

Structural insights into the activation mechanism of the human metabolite receptor HCAR1. Gao M, Zang S et al. Sci Signal. 2026 Jan 6;19(919):eadw1483.

Crystal structure of Methanococcus jannaschii dihydroorotase with substrate bound. Vitali J, Nix JC et al. Acta Crystallogr F Struct Biol Commun. 2026 Jan 1;82(Pt 1):23-31.

Correlation between solvation free energy and solute-solvent interaction energy in energy representation theory. Maruyama Y, Matubayasi N. J Phys Chem B. 2025 Dec 25;129(51):13230-13241.

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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.

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

conservation coloring

Coloring by Conservation

A structure can be colored to show attributes such as residue conservation. Opening a sequence alignment in Chimera shows it in Multalign Viewer and automatically associates sequences with structures as appropriate. Residues of alignment-associated structures are assigned conservation values; available measures include entropy, variability, and sum-of-pairs. The figure was created using the PFAM Carb_anhydrase seed alignment PF00194_seed.slx (see image) and includes 2D labels and a color key. See also: mapping sequence conservation

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Gallery Sample

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Peroxiredoxin Wreath

Peroxiredoxins are enzymes that help cells cope with stressors such as high levels of reactive oxygen species. The image shows a decameric peroxiredoxin from human red blood cells (Protein Data Bank entry 1qmv), styled as a holiday wreath.

See also the RBVI holiday card gallery.

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