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Explants of distal interdigital space 2 (2ID: A,B) or distal digital ray 3 (D3: C,D) were taken from HH27 legs (distal 150 µm plus AER) and grafted to the somites of HH20 hosts. 2ID and D3 explants both formed ectopic digits with phalanges (alcian blue staining, A,C) and claws (white keratinized area in fresh specimens, B,D), detected 8–10 days after transplantation.
