>3n20B (B:) observed residues (from ATOM records)
alkplktwshlagnrrrpseyevvstnlhyftdnperpweldsnlpmqtwykkycfdspl
khddwnafrdpdqlvyrtynllqdgqesyvqglfdqlndrghdqmltrewvetlarfytp
arylfhalqmgsvyihqiapastitncatyetadhlrwlthtayrtrelancypdvgfgk
rerdvwendpawqgfreliekaliawdwgeaftainlvtkpaveeallqqlgslaqsegd
tllgllaqaqkrdaerhrrwssalvkmalekegnrevlqkwvakwepladkaieaycsal
pdgenaiveaksasryvrqmmg