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Fig. 6. Expression of PRCE and Fgf5 during early mouse embryogenesis Analysis of PRCE (A) and Fgf5 (B) expression by whole mount in situ hybridization of 3.5-5.5 d.p.c. mouse embryos using antisense digoxygenin-labelled riboprobes. Bar, 50 µm. Display of two embryos at a given time point indicates inconsistent expression, interpreted as marking the time of upregulation.