title: A micro-procedure for the preparation of highly purified  14 C-,  35 S-, and  32 P-labeled transcriptases from E. coli.
mesh_terms: D002247:Carbon Isotopes; D003470:Culture Media; D004792:Enzyme Precursors; D004926:Escherichia coli / Q000201:enzymology*; D008722:Methods; D010759:Phosphorus Isotopes; D012316:RNA Nucleotidyltransferases / Q000302:isolation & purification*; D013460:Sulfur Isotopes
chemical_list: D002247:Carbon Isotopes; D003470:Culture Media; D004792:Enzyme Precursors; D010759:Phosphorus Isotopes; D013460:Sulfur Isotopes; D012316:RNA Nucleotidyltransferases