>1rk4B (B:) observed residues (from ATOM records)
gncpfsqrlfmvlwlkgvtfnvttvdtkrrtetvqklcpggqlpfllygtevhtdtnkie
efleavlcpprypklaalnpesntagldifakfsayiknsnpalndnlekgllkalkvld
nyltsplpeevdgvsqrkfldgneltladcnllpklhivqvvckkyrgftipeafrgvhr
ylsnayareefastcpddeeielaye