Distribution of anti-β-GAL immunoreactivity in aper⁺ SG3 transgenic adult male.A, Staining pattern at the level of the esophagus, in a horizontal section (the others depicted here are in the same plane). Scale bar, 40 μm. B, Magnification ofA; arrow points to a group of the LN_v (relatively ventral LNs; see Ewer at al., 1992);arrowheads point to glia cells in the outer rim of the medulla, in the cortex, and to glia located at the border between the cortex and the neuropil of the central brain. Scale bar, 8 μm.C, A different section located just ventral to that inA and B; the arrow points to LN_v, arrowheads to glia cells located in the lamina and the outer rim of the medulla. Scale bar, 12.5 μm.D, A section showing not only LN_v(arrow), but also glia cells in the second optic chiasm (arrowhead). Scale bar, 12.5 μm.