in tx rats receiving [ 125i ] t4 alone the brain cortex to serum t3 ratio was 3:1 , but the total serum t3 concentration , measured by ria , was much higher than that due to conversion [ 0.50 +/- ( se ) 0.1 pmol/ml vs. 0.018 +/- 0.002 pmol t3/ml ] , indicating thyroidal secretion .
C0006104
brain
C0086045
concentration