>1b4sA (A:) observed residues (from ATOM records)
vnkertflavkpdgvarglvgeiiaryekkgfvlvglkqlvptkdlaeshyaehkerpff
gglvsfitsgpvvamvfegkgvvasarlmigvtnplasapgsirgdfgvdvgrniiggsd
svesanreialwfkpeelltevkpnpnlye