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The influence of a recombinant chicken prolactin (rcPRL) preparation on thyroid function was studied in 18- and 19-day-old chicken embryos. Displacement studies on hepatic microsomes indicate that this preparation does not compete with radiolabeled chicken growth hormone (cGH) for hepatic GH-receptor binding. In a first series of experiments rcPRL or immunoaffinity-purified cGH was injected intravenously...