>1x99B (B:) observed residues (from ATOM records)
msysitlrvyqtnrdrgyfsivektvwhfanggtwseangahtltmggsgtsgmlrfmst
kgeritvavgvhnykrwcdvvtglkpdetalvinpqyynnggrdyvrekqlaeysvtsai
gtkvevvytvaegnnleanvifs