>2b50B (B:) observed residues (from ATOM records)
npqvadlkafskhiynaylknfnmtkkkarsiltghtapfvihdietlwqaekglvwklp
pykeisvhvfyrcqcttvetvreltefaksipsfsslflndqvtllkygvheaifamlas
ivnkdgllvangsgfvtreflrslrkpfsdiiepkfefavkfnalelddsdlalfiaaii
lcgdrpglmnvprveaiqdtilralefhlqanhpdaqqlfpkllqkmadlrqlvtehaqm
mqrikktetetslhpllqeiykd