>1a4xA (A:) observed residues (from ATOM records)
kavildeqairraltriahemiernkgmnncilvgiktrgiylakrlaerieqiegnpvt
vgeiditlyreplvkgadipvditdqkvilvddvlytgrtvragmdalvdvgrpssiqla
vlvdrghrelpiradyigkniptsksekvmvqldevdqndlvaiyen