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Regional differentiation of the brain in embryos of Fundulus heteroclitus

, : Regional differentiation of the brain in embryos of Fundulus heteroclitus. J Exp Zool 129(3): 649-682

Grafts representing 4 antero-posterior levels of the embryonic shield of Fundulus embryos and consisting of all germ layers, when implanted into the prospective midbrain region, have differentiated or induced the differentiation of secondary brain parts which are identifiable as to regional level of differentiation. A second group of embryos is available in which similar grafts have been implanted into the prospective hindbrain region. The two series include 58 individuals of which 45% contain only secondary parts characteristic of the level at which they are located (homomorphic), 10% contain only secondary parts characteristic of other levels of the host than those at which they are located (heteromorphic), while 45% have differentiated both homomorphic and heteromorphic secondary parts. The secondary parts in both series have become located at all antero-posterior levels of the head between telencephalon and medulla. In both series the highest percentage of secondary parts has become located at the hindbrain level. In the midbrain series, 55% of the 156 secondary parts have differentiated homomorphically, 45% hetero-morphically; in the hindbrain series, 58% of 92 secondary parts have differentiated homomorphically, 42% heteromorphically. In both series the most frequently differentiated brain tissue is optic tectum. It is concluded that factors resident in both hosts and grafts have interacted to produce the described results.


DOI: 10.1002/jez.1401290311

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