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Barrier experiments. Tantalum foil barriers inserted into developing phalanges affect the size of the distal phalanges. Barriers inserted into developing metatarsals affect metatarsal length but not the patterning of the phalanges. The top digit in each pair is the contralateral control. Proximal is to the left. Images are aligned by metatarsal–phalangeal joint (MTPJ).
