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Fig. 5. Expression of CRTR-1, Rex1 and Psc1 during early mouse embryogenesis. Analysis of CRTR-1 (A), Rex1 (B) and Psc1 (C) 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 downregulation.