>3bx4A (A:) observed residues (from ATOM records)
dcdfgwspydqhcyqafneqktwdeaekfcraqengahlasiesngeadfvswlisqkde
ladedyvwiglraqnkeqqcssewsdgssvsyenlidlhtkkcgalekltgfrkwvnyyc
eqmhafvckllp