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Fig. 8. Expression of Hoxa1 and Hoxb1 in vehicle-treated and BMS453-treated wild-type embryos after 24 hours in culture. All embryos were cut sagittally into halves and the medial side of the right half is displayed. aE and pE, anterior and posterior parts of the pharyngeal endoderm, respectively; F, frontonasal process; R3 and R4, rhombomeres 3 and 4, respectively.