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Additional resources for Pigment Cell Biology. Proceedings of the Fourth Conference on the Biology of Normal and Atypical Pigment Cell Growth
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Torosus larvae; Fig. 17d, untreated control; Fig. 17e, treated from stage 32 to 39; Fig. 17f, treated from stage 32 to 42. See discus sion in text. colorless areas (see Fig. 17). It is particularly significant that there was no preliminary migration or reaggregation observed in establishing the definitive melanophore patterns. It was quite apparent that the pro spective melanophores had migrated and reaggregated in an entirely normal manner at appropriate stages in development in spite of the complete absence of melanin formation, and they were present in their definitive positions by the time the treatment had ended.
1947. Physiol Zool 20, 248-266. Rosin, S. 1943. Rev. suisse zool δΟ, 485-578. Sato, T. Emhryologia 1, 21-57. Steamer, S. P. 1946. Physiol Zool 19, 370-404. Stone, L. S. 1950. / . Exptl Zool 113, 9-32. Stone, L. , and Steinitz, H. 1957. / . Exptl Zool 135, 301-318. Twitty, V. C. 1944. / . Exptl Zool 95, 259-290. Twitty, V. C. 1945. / . Exptl Zool 100, 141-178. Twitty, V. C. 1953. Discussion in "Pigment Cell Growth" ( M . ), p. 26. Academic Press, New York. Twitty, V. C , and Niu, M. C. 1948. / .
Although melanophores undergo degeneration in normal develop ment, there is no information concerning their longevity. In the epi dermis, the matured melanophores discharge not only melanin granules, but also some dendritic processes. As a result, they may appear to differ very Httle from the pigmented epithelial cells. Examination of the sloughed skin reveals the occasional presence of slightly branched melanophores, showing some peripheral destruction. REFERENCES Abercrombie, M. 1957. Proc.