>3mxtA (A:) observed residues (from ATOM records)
amqvitsvkeakqivkdwkshqlsigyvptmgflhdghlslvkhaktqdkvivsifvnpm
qfgpnedfssyprdlerdikmcqdngvdmvfipdatqmylknfstyvdmntitdklcgak
rpghfrgvctvltkffnilnpdivymgqkdaqqcvvvrhmvddlnfdlkiqicpiireed
glakssrnvylskeerkaslaisqsiflaeklvregekntskiiqamkdilekeklikid
yielvdfntmenienitdnvlgavaafvgktrlidnflvqglk