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Figure 6


Fig. 6. PA2 neural crest derivatives. Skeleton preparations of E15.5 middle ears (A,B,D) and hyoid cartilages (E,F). PA1, 2 derivatives are traced in C,G,H. PA1 neural crest derivatives, traced in blue: i, incus, m, malleus, ty, tympanic ring, mc, Meckel's cartilage. PA2 derivatives, traced in red, are hypoplastic or missing in mutants: (C) s, stapes, sp, styloid process; (G,H) lesser horns of hyoid. Ectopic cartilages were observed in mutant ears (arrows in B,D; yellow in C).





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