>1xl3A (A:) observed residues (from ATOM records)
arvsdveeqvnqylskvpeqnvsellsllsnspnislsqlkaylegkseepseqfkmlcg
lrdalkgrpelahlshlveqalvsmaeeqgetivlgaritpeayresqsgvnplqplrdt
yrdavmgyqgiyaiwsdlqkrfpngdidsvilflqkalsadlqsqqsgsgreklgivisd
lqklkefgsvsdqvkgfwqffs