title: Escherichia coli lactose repressor: isolation of two different homogeneous headpieces and the existence of a hinge region between residues 50 and 60 in the repressor molecule.
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics / Q000302:isolation & purification; D002918:Chymotrypsin; D004926:Escherichia coli / Q000378:metabolism*; D005809:Genes, Regulator; D007785:Lactose / Q000378:metabolism*; D010447:Peptide Hydrolases; D014357:Trypsin
chemical_list: D001426:Bacterial Proteins; D010447:Peptide Hydrolases; D002918:Chymotrypsin; D014357:Trypsin; D007785:Lactose