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Elevation of KOR-lacZ expression in developing mouse embryos derived from vitamin A-deficient (A−) mothers.A, A control transgenic embryo stained with lacZ.B, An A− embryo stained with lacZ. C, Internal staining of control embryo shown in A.D, Internal staining of an A− embryo shown inB. c, Cortex; dt, dorsal thalamus; ea, ear; ey, eye;h, hippocampus; m, medulla;n, nose; nt, neural tube;p, pons; v, ventral tegmental nucleus.
