>1xb2B (B:) observed residues (from ATOM records)
sasskellmklrrktgysfinckkaletcggdlkqaeswlhkqaqkegwskaarlhgrkt
kegligllqegdttvlvevncetdfvsrnlkfqqlvqqvalgtllhcqnlkdqlstyskg
flnsselselpagperegslkdqlalaigklgenmilkraawvkvpagfyvgsyvhgamh
spslhnlvlgkygalvicetselkanladlgrrlgqhvvgmaplsvgslddepggeaetk
mlsqpylldpsitlgqyvqphgvsvvdfvrfecgeg