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Fig. 1. Schematic representation of grafting experiments and resulting E15
quail-chick chimeras. Grafting of midbrain (control, A), cardiac (C) and trunk
(E) dorsal neural tube tissues from stage 9-10 quail donors into stage 9 chick
hosts results in highly pigmented E15 chimeras B, D and F, respectively.
Cardiac neural crest chimeras form a distinct pigmented mass of cells (D,
arrow) on the dorsal region of the cornea.