Several lighting modes are available, including ambient occlusion. The image shows hemoglobin (PDB 4hhb) with the four chains shown as surfaces of different colors and heme residues as spheres. The command lighting soft or the Graphics icon can be used to turn on ambient shadowing from 64 directions. The command lighting gentle gives a similar result, except tuned to emphasize larger indentations.

Photosynthetic Reaction Center

The photosynthetic reaction center from a purple sulfur bacterium is shown as a cartoon with “tube” helices and membrane boundaries from the OPM database (Orientations of Proteins in Membranes, entry 1eys). Blue and red balls represent the cytoplasmic and periplasmic sides of the bacterial inner membrane, respectively. The title and other text labels were added with the 2dlabels command and repositioned interactively with the move label mouse mode . ChimeraX session file: prc.cxs

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