>3is7A (A:) observed residues (from ATOM records) dkkviqhlnkilgneliainqyflhsrmwndwglkrlgaheyhesidemkhadklieril fleglpnlqdlgklligentqemlqcdlnlelkatkdlreaivhceqvhdyvsrdllkdi leseeehidyletqlgliqkvglenylqshmhe