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Histology of exencephalic mutants. Sagittal sections of wild-type (A and D), 118 (opb2) (B and E), and opm (homozygous for the C57BL/6J region of proximal chromosome 12 of line 105) (C and F) 10.5-dpc embryos. The cranial mesenchyme cells of opm appeared small, spindle-shaped, and widely spaced.
