Metabolic Studies on Mammary Tumor MTW9 following Resection of the Mammosomatotropic Tumor MtTW5

The regression of mammary tumor MTW9 after resection of mammosomatotropic tumor MtTW5 has been studied further. Twenty-four hr after resection of MtTW5, MTW9 DNA was increased while incorporation of thymidine-3H into MTW9 was decreased. Uptake of α-aminoisobutyric acid, glycine, methionine, and possibly phenylalanine into the trichloroacetic acid-soluble fraction of MTW9 slices was reduced 24 hr after MtTW5 resection. Incorporation of glycine, methionine, and phenylalanine into MTW9 protein was also reduced under these conditions.