Fig. 3. Histology of wild-type (A,C,E) and BAenh^–/– mutant (B,D,F) mice at P1. (A,B) The secondary palate formed by fusion of bilateral palatine bones (pa) in the wild-type mouse (A) is absent in the BAenh^–/– mutant mouse (arrows in B). Muscle fibers of the tongue (tg) are irregular and sparse in the mutant mouse. (C,D) Wild-type and homozygous mutant mice both show symphysis of Meckel's cartilage (asterisk) and lower incisors (i). (E,F) The junction between the malleus (m) and Meckel's cartilage (mc) is observed in wild-type and mutant mice. oc, otic capsule. Bars indicate 300 µm.

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