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By P. D. Evans, V. B. Wigglesworth

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Neurobiol. 11,623-628. Schwarz, T. , Lee, G. , Siwicki, K. K . , Standaert, D. G. and Kravitz, E. A. (1984). Proctolin in the lobster: the distribution, release, and chemical characterization of a likely neurohormone. J . Neurosci. 4,1300-1311. Selverston, A. , Russel, D. , Miller, J. P. and King, D. (1976). The stomatogastric nervous system: structure and function of a small neural network. Prog. Neurobiol. 7,215-290. Siwicki, K. K. and Bishop, C. A. (1985). Mapping of proctolin-like immunoreactivity in the nervous systems of lobster and crayfish.

Radioimmunoassay measurements showed that its level was low at the beginning of the pupal instar when the eupyrene spermatocytes elongate and the apyrene spermatocytes are only undergoing mitosis. , 1982). A higher ecdysteroids titre might thus be necessary for apyrene differentiation. However, it might also be that both types of spermatogenesis, as well as the female trophoytes and I N S E C T R E PRO D U CTI 0 N 45 oocytes, are determined at a much earlier stage. Data on this point seem to be lacking.

And O’Shea, M. (1982). Neuropeptide proctolin (H-Arg-Try-LeuPro-Thr-OH): Imrnunocytochemical mapping of neurons in the central nervous system of the cockroach. J . Comp. Neurol. 207,223-238. Bishop, C . , O’Shea, M. and Miller, R. J. (1981). Neuropeptide proctolin (H-Arg-Tyr-Leu-Pro-Thr-OH): Immunological detection and neuronal localization in insect central nervous system. Proc. Natl. Acad. Sci. USA 78,5899-5902. Bishop, C. , Wine, J. J. and O’Shea, M. (1984). Neuropeptide proctolin in postural motoneurons of the crayfish.

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