By Myron Gordon
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Extra info for Pigment Cell Biology. Proceedings of the Fourth Conference on the Biology of Normal and Atypical Pigment Cell Growth
Sample text
Between the posterior mar- TOROSUS HOST TOROSUS AXOLOTL CREST SroE AXOLOTL HOST AXOLOTL TOROSUS C R E S T SroE FIG. 13. Melanophore — xanthophore segregation in axolotl torosus chimeric crest larvae. Diagram of an experiment involving the unilateral exchange of trunk neural folds between axolotl and torosus neurulae. See discussion in text. 26 Η. Ε. LEHMAN AND LILLIAN Μ . YOUNGS gins of the gills and cloaca) would be included even though they were frequently abundant anterior and posterior to these landmarks.
The evidence from guanophore distribution in metamorphosed chi meric crest juveniles (Fig. 15a, b, and c ) throws light on a question orig inally framed by Twitty (1945) concerning the origin of the spotted pattern in adult amblystomids. In connection with the possibility that the mechanism of melanophore-xanthophore segregation noted in early larval stages might be causally related to this pattern in the adult, he states, . it seems entirely probable that the experimental observations, both in vitro and in vivo will be directly applicable in interpreting the changes which lead to the formation of the larval and adult pigment patterns of the axolotl.
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