loop_ _pdbx_feature_sequence_range.id _pdbx_feature_sequence_range.seq_range_id _pdbx_feature_sequence_range.feature_name _pdbx_feature_sequence_range.feature _pdbx_feature_sequence_range.feature_type _pdbx_feature_sequence_range.feature_assigned_by _pdbx_feature_sequence_range.feature_software_id 1 H1 'secondary structure' '4-helix (alpha-helix)' value DSSP DSSP 2 T1 'secondary structure' 'hydrogen-bonded turn in beta-ladder' value DSSP DSSP