>4trrB (B:) observed residues (from ATOM records)
snlngktavvtgaasgigkeialelakagaavaiadlnqdganavadeinkaggkaigva
mdvtneeavntgidkvaeafgsvdilvsnagiqivnpienysfadwkkmqaihvdgaflt
tkaalkhmykddrggvviymgsvhsheasplksayvtakhgllglarvlakegakhnvrs
hvvcpgfvrtplvdkqipeqakelgiseeevikkvmlgntvdgvfttvqdvaqtvlflsa
fpsaaltgqsfivshgwfmq