>1a21B (B:) SEQRES residues tgraynltwkstnfktilewepksidhvytvqistrlenwkskcfltaetecdltdevvk dvgqtymarvlsyparngnttgfpeeppfrnspeftpyldtnlgqptiqsfeqvgtklnv tvqdartlvrrngtflslravfgkdlnytlyywrasstgkktattntneflidvdkgeny cfsvqavipsrkrkqrspesltect