>1i21Y (Y:) observed residues (from ATOM records)
lpdgfyirrmeegdleqvtetlkvlttvgtitpesfcklikywneatvwndnedkkimqy
npmvivdkrtetvaatgniiierkiihelglcghiediavnskyqgqglgkllidqlvti
gfdygcykiildcdeknvkfyekcgfsnagvemqir