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Fig. 1. Expression of Barx2 and GDF5 during mouse embryogenesis and limb development. Barx2 mRNA expression at E11.5 (A) and E13.5 (B). Barx2 (C,E) and GDF5 (D,F) are expressed in a similar pattern in the prechondrogenic condensations and in the digital rays at E11.5 (C,D) and in phalangeal joints at E13.5 (E,F). ce, conjunctival epithelium; sgp, submandibular gland primordium; vib, vibrissa; ext.e, external ear; fl, forelimb; hl, hindlimb.