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Fig. 5. Whole-mount immunostaining of corneas from E15 chimeras. Quail neural crest-derived neurites are QN-positive (red; A,C,E) and all neurites are counterstained with TuJ1 (green; B,D,F). Numerous QN-positive neurites are seen in midbrain control (A,B) but the number decreases in cardiac (C,D) and trunk (E,F, arrowheads) chimera corneas.