title: Letter: Preliminary crystallographic data for Escherichia coli beta-lactamase.
mesh_terms: D002729:Chloromercuribenzoates; D003460:Crystallization; D003461:Crystallography; D004926:Escherichia coli / Q000201:enzymology*; D008970:Molecular Weight; D010405:Penicillinase / Q000032:analysis* / Q000302:isolation & purification; D011487:Protein Conformation; D014961:X-Ray Diffraction
chemical_list: D002729:Chloromercuribenzoates; D010405:Penicillinase