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Fig. 2. (A) Tbx5 is expressed in the developing forelimb and not the developing hindlimb. (B,C) Tbx4 (B) and Pitx1 (C) are expressed in the developing hindlimb and not the forelimb. Each panel shows whole-mount in situ hybridization on stage 29 chick embryos. Reproduced from Logan et al. (Logan et al., 1998).