Folding@Home

[JT]

It's most likely a sulfur atom. Generally, these are the atoms and their corresponding colors in amino acids:

black: carbon
red: oxygen
blue: nitrogen
white: hydrogen
yellow: sulfur

Sulfur is found in methionine (R-group: -CH2-CH2-S-CH3) and cysteine (R-group: -CH2-SH) - that one is most likely the thiol group of cysteine as methionine is only found at the first position in the protein chain/polypeptide.

Thanks. I was confident of the black (well, dark gray) and white (well, light gray), and was pretty sure that blue and red were, in some order, oxygen and nitrogen (I never got a molecular model kit to play with, though)

The thing is that I've only seen the one yellowish-green, and only for a while (perspective / frame-size could account for that), so I figured that something that's "normal" wouldn't be so "rare."

Not that I'm gonna understand a thing about the program/projects, just by looking at pretty displays....