An in-vivo bioassay for human growth hormone (hGH) has been developed, based on the dose-related enhancement of radioactivity in skin of hypophysectomized rats given daily s.c. injections of hGH and a single i.p. injection of labelled proline. The measured radioactivity, taken as the response, was shown to be independent of the site at which the skin was sampled. Valid dose–response relationships were obtained after as little as 3 days of treatment with GH.
The assays by this method are shown to be more precise than the widely used weight-gain and tibial-width bioassays. Assays carried out gave an average index of precision of 0·036.
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Online ISSN: 1479-6805
Print ISSN: 0022-0795
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