>1u91B (B:) SEQRES residues
ritlkesgpplvkptqtltltcsfsgfslsdfgvgvgwirqppgkalewlaiiysdddkr
yspslntrltitkdtsknqvvlvmtrvspvdtatyfcahrrgpttlfgvpiargpvnamd
vwgqgitvtisststkgpsvfplapsskstagaaaalgclvkdyfpepvtvswnsgalts
gvhtfpavlqssglyslssvvtvpssslgtqtytcnvnhkpsntkvdkrvepksc