>3d7aA (A:) observed residues (from ATOM records)
mtmfeeveveayvyptedirkvkkamlnlipglqfeafdkgeyvilvgrtkdkralqrly
elfrgqqildtarmmleegyfgeeiiikvhkqvayvgkvnfnedsplgpititirtkepq
klmkwlaprtkdgvpie