>1usfB (B:) SEQRES residues
mrsyraqgplpgfyhyypgvpavvgvrveervnfcpavwntglsadpplfgvsispkrft
hglllkarrfsasfhpfgqkdlvhwlgshsgrevdkgqaphflghtgvpilegayaayel
ellevhtfgdhdlfvgrvvavweeeglldekgrpkpglallyygkglygrpaeetfap