>4itwB (B:) observed residues (from ATOM records)
seelldlfnrqvtqeftasqvylsasiwfdqndwegmaaymlaesaeerehglgfvdfan
krnipielqavpapvscaewsspedvwqsileleqantrsllnlaeaastchdfavmafl
npfhlqqvneedkigsilakvtdenrtpgllrsldvvs