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Hello All, I have a couple of cysteines with some extra density about 1 covalent bond's length away from the sulfur center. It looks to be one atom's worth of extra density. Because I could fit it in an icon sized graphic and I anticipate that someone will suggest I post a picture, I'm attaching a picture of the positive fofc density. Does anyone have any idea of the usual culprits here? I see no negative density in the region. James