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A well-defined proton entry pathway exists in GFP, and it shows a remarkable resemblance to the D-pathway in CcO. The suggested pathway is depicted by dashed arrows, with distances in angstroms, as measured using the coordinates from PDB file 1GFL. No hydrogens are depicted here. The problematic steps involving W255 are denoted in red. Curiously enough, only the part of the HB-net between W60 and Tyr-66 was depicted in previous publications.
