per-Expressing cells in the head of a per⁺ XLG-B transgenic adult at ZT21. The sections of the male were stained with anti-β-GAL antibody (staining of this line is more intense than in XLG-A, but the spatial pattern is identical; compare Fig. 10) (also data not shown).A, Six LN_d cells (open arrow) are visible in this section (diameter, ∼5–6 μm); the solid arrow points to two large cells (diameter, ∼11 μm) from the relatively dorsal region of the LN_v group;arrowheads indicate glia cells bordering the medulla. Scale bar, 12.5 μm. B, Higher magnification ofA. Scale bar, 8 μm. C, The solid arrow points to LN_v; four cells of smaller size (diameter, ∼4–5 μm) are visible in this plane. D, DNs (arrow); note that the nucleus seems stained lighter than the surrounding cytoplasm (diameter, ∼3–5 μm). Magnifications in C and D are as in A. E, PR staining, which appears mainly cytoplasmic (the nuclei cannot be distinguished from the soma); the open arrow points to a group of LN_d. Scale bar, 25 μm.