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GROWTH MORPHOLOGY AND DIFFERENTIATION
Neural Tube Transfer Experiment
13 other sections not shown
3H-thymidine cell cycle cell front cell migration cell outgrowth collagen crest cell migration day five pigment day in culture days in vitro differentiate into pigment DNA synthesis dorsal root ganglia embryo extract experiments extracellular materials fibroblastic fibroblastic cells Figure l5 five pigment cells fraction of labeled label index curve labeled mitoses length of Gl+G2+M Materials and Methods melanocytes melanogenesis metencephalon microtest migration on collagen mitosis mitotic index morphogenesis myoblast neural crest cells neural crest cultures neural crest derivatives neural crest migration neural tube culture Neural tube explant neurons Noden nuclei number of cells observed onset of migration percentage of cells phenotype photograph pigment cell phenotype pigment cells population primary cultures primary neural crest processed for autoradiography proliferation Rat tail collagen secondary cultures shown silver grains small stellate cells somite standard deviation substrate synchrony thymidine tion tissue culture plastic trunk neural crest um/hour visible pigment granules vitro were labeled White Leghorn