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Serum PRL levels in a woman with isolated PRL deficiency. Serum PRL was measured during breast pumping (indicated by the time from −3 to 0 h) and up to 8 hours after administration of r-hPRL (60 μg/kg every 12 h). Measurements were performed on injection days 1 (closed circles), 7 (closed triangles), and 28 (closed diamonds), as well as 1 week after the last r-hPRL injection (d 35, open squares).
