>3ck1A (A:) observed residues (from ATOM records)
gmtavfrntvlvrfkhcdaagivfypryfemlndfiedwfaqaldwpfdamhgagqagvp
tadlhcrfvapsrlgetltrelrvvklgqssftvqvrfmgpdsglrlevtqrlvcvdtdk
iaprplpdpvrqamatyvdetla