Figure 1

Short-term effects of L-thyroxine on the newly synthesized phosphoinositides levels in liver. Panel A – 90-day-old rats; panel B – 720-day-old rats. The liver lipids were labeled by [¹⁴C]CH₃COONa as described in "Materials and Methods". The L-T₄ (200 μg/100 g weight) was injected to the normal rats 15 and 60 min prior to killing. The lipids were extracted and separated as described in "Materials and Methods" and the radioactivity was determined by a liquid scintillation counter. Results are mean ± S.E. of six experiments performed in duplicate.