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In tetrapod limbs, an anteriormost digit has common traits of small, short and less‐phalange morphology. In this study, we focused on three genes, Mkp3, Sef and Tsukushi (TSK), which have anterior‐specific or anterior‐prominent expression patterns in the developing limb bud at the autopod‐forming stage. The anterior expression is not fixed in the period of limb development, but the expression domains...