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SUMMARY Twenty-day-old male rats were injected intraperitoneally with either human luteinizing hormone (HLH) or human growth hormone (HGH) labelled with 125I. The localization of these hormones 1–2 hr. after injection was examined under the light microscope after radioautography. Major sites of localization of labelled LH were the interstitial cells of the testis and the proximal convoluted tubule of the kidney. Some hormone was also present in adipose tissue, hepatic parenchymal cells, the mesothelial lining of the peritoneum and underlying macrophages. HGH was localized principally in the proximal convoluted tubule of the kidney with some hormone present in liver, adipose tissue, and the suprarenal cortex.
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Kretser et al. (1969) studied this question.
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