>4yc1B (B:) observed residues (from ATOM records)
gmasmavsesqlkkmvskykyrdltvretvnvitlykdlkpvldsyvfndgssrelmnlt
gtipvpyrgntynipiclwlldtypynppicfvkptssmtiktgkhvdangkiylpylhe
wkhpqsdllgliqvmivvfgdeppvfsrp