>1z4rA (A:) observed residues (from ATOM records)
sgiiefhvignsltpkanrrvllwlvglqnvfshqlprmpkeyiarlvfdpkhktlalik
dgrviggicfrmfptqgfteivfcavtsneqvkgygthlmnhlkeyhikhnilyfltyad
eyaigyfkkqgfskdikvpksrylgyikdyegatlmecelnpr