we have compared the effectiveness of trh and a rat hypothalamic prl-releasing factor ( prf ; previously incubated with rat serum to destroy trh ) in stimulating the release of prl into the plasma of conscious lactating rats when injected before and after pituitary prl had been depleted and transformed into releasable prl by 10 min of suckling .
C0229671
serum
C0032105
plasma