The effect of subcutaneous injections of arginine on the growth of the U.C.L.A. fibrosarcoma and the Jensen sarcoma has been studied with male and female rats. Growth-stimulating and growth-inhibiting effects of arginine on these tumors have been observed depending upon the experimental conditions.

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Paper No. 97. For the preceding related paper (No. 95) see Levy et al. (12). This work was supported by Cancer Research Funds of the University of California.

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