>3n20A (A:) observed residues (from ATOM records)
smlkredwydltrttnwtpkyvtenelfpeemsgargismeawekydepykitypeyvsi
qrekdsgaysikaalerdgfvdradpgwvstmqlhfgaialeeyaastaearmarfakap
gnrnmatfgmmdenrhgqiqlyfpyanvkrsrkwdwahkaihtnewaaiaarsffddmmm
trdsvavsimltfafetgfvnmqflglaadaaeagdhtfaslissiqtdesrhaqqggps
lkilvengkkdeaqqmvdvaiwrswklfsvltgpimdyytplesrnqsfkefmlewivaq
ferqlldlgldkpwywdqfmqdldethhgmhlgvwywrptvwwdpaagvspeerewleek
ypgwndtwgqcwdvitdnlvngkpeltvpetlpticnmcnlpiahtpgnkwnvkdyqley
egrlyhfgseadrwcfqidperyenhtnlvdrflkgeiqpadlagalmymslepgvmgdd
ahdyewvkayq