Abstract
WHEN cystine labelled with sulphur-35 is injected intraperitoneally1 or intravenously into a sheep, radioactivity is detectable in the wool follicles, just above the bulb, within a few minutes, and appears in the fully keratinized fibre some hours later. If the rate and position of entry of cystine into the fibres can be presumed to be constant, repeated injections of labelled cystine at known intervals of time followed by autoradiography of the fibres should provide a method of measuring wool growth. Paduceva2 has discussed this possibility without, however, giving any quantitative results to assess the accuracy of the method.
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References
Ryder, M. L., Proc. Roy. Soc. Edin., B, 67, 65 (1958).
Paduceva, A. L., Ovcevodstvo, 3 (9), 22 (1957).
Doniach, I., and Pelc, S. R., Brit. J. Radiol., 23, 184 (1950).
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DOWNES, A., LYNE, A. Measurement of the Rate of Growth of Wool using Cystine labelled with Sulphur-35. Nature 184, 1884–1885 (1959). https://doi.org/10.1038/1841884a0
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DOI: https://doi.org/10.1038/1841884a0
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