An injection of triiodothyronine and glucagon stimulates the growth of several mouse tissues. The greatest increase in DNA specific activity occurred in the cells of the exocrine pancreas after a lag period of about 30 hr. There was also an increase in cell proliferation in the liver. Cellular hypertrophy, as measured by the ratio of RNA to DNA was increased in liver and kidney. This system should prove to be particularly useful for studying the factors controlling pancreatic growth.
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