Astrocyte nuclei in the SCN were labeled in green by Cre-mediated recombination of Aldh1L1-Cre/+;LSL-GFPNLS/+ mice. Coronal brain sections were immunostained for an astroglial marker, GFAP (A), a neuronal marker, FOX2 (B) or a circadian clock protein, BMAL1(C) in red and all nuclei were counter stained with DAPI. Cells within the yellow boxes (left) were magnified (right). Filled arrowheads indicate double-labeled cells and arrows point to cells that showed no red and green colocalization. Note that Aldh1L1-positive cells reliably express the astrocyte marker, GFAP, and the circadian clock protein, BMAL1, but not the neuronal marker, FOX2. Scale bar = 75 μm. See also
Figure S1.