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The external genital and ventral limb progenitor pools are contiguous (a) Schematic diagram of a dorsal view of a stage 18 chick embryo showing the position of a single injection of DiI (red dot) to the anterior-medial side of zone 2. (b, c) After 48 hours, labeled cells are restricted to the right side of the genital tubercle and the posterior aspect of the ventral side of the right hindlimb. Note labeled cells do not cross the midline of the genital tubercle (broken red line).
