Figure 2

Age- and thyroxine-dependent fluctuations of newly synthesized [¹⁴C]-DAG and [¹⁴C]-FFA level in liver. The liver lipids were labeled by [¹⁴C]CH₃COOH as described in "Materials and Methods". T₄ (200 μg/100 g weight) was injected to the normal rats 15, 30 and 60 min prior to killing. Control rats received the same volume of 0.9% NaCl. Lipids were extracted and separated as described in "Materials and Methods" and the radioactivity was determined by liquid scintillation counter. Results are mean ± S.E. of six individual experiments. ^* P < 0.001 vs. 90-day-old rats, ^** P < 0.05, ^*** P < 0.001 vs. control rats.