>1a21B (B:) SEQRES residues adttgraynltwkstnfktilewepksidhvytvqistrlenwkskcfltaetecdltde vvkdvgqtymarvlsyparngnttgfpeeppfrnspeftpyldtnlgqptiqsfeqvgtk lnvtvqdartlvrrngtflslravfgkdlnytlyywrasstgkktattntneflidvdkg enycfsvqavipsrkrkqrspesltectsreqgraremf