>1z19A (A:) observed residues (from ATOM records)
mtlhswldryekilasrgikqktlinymskikairrglpdapledittkeiaamlngyid
egkaasaklirstlsdafreaiaeghittnhvaatraakskvrrsrltadeylkiyqaae
sspcwlrlamelavvtgqrvgdlcemkwsdivdgylyveqsktgvkiaiptalhidalgi
smketldkckeilggetiiastrreplssgtvsryfmrarkasglsfegdpptfhelrsl
sarlyekqisdkfaqhllghksdtmewdkieik