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has been partially purified from rat liver (Grisolia & Cohen, 1952; Reichard, 1957), from ox liver (Burnett & Cohen, 1957) and from Streptococcus lacts (Ravel, Grona, Humphreys & Shive, 1959). Some properties of the enzyme have been studied and certain differences between the preparations have been observed. However, since different buffers and assay systems have been used, the extent to which these differences are significant is difficult to assess. Brown & Cohen (1960) have suggested an evolutionary significance in the distribution of urea-cycle enzymes. The present study was undertaken to find out whether or not ornithine carbamoyltransferase showed variation in its properties when prepared by identical procedures from different sources. The properties of the ox enzyme

Studies on carbamoyl phosphate-l-ornithine Carbamoyltransferase from ox liver