>1i21N (N:) observed residues (from ATOM records)
gfyirrmeegdleqvtetlkvltttpesfcklikywneatvwndnkimqynpmvivdkrt
etvaatgniiierkiihelglcghiediavnskyqgqglgkllidqlvtigfdygcykii
ldcdeknvkfyekcgfsnagvemqirk