Multiplexed bioluminescence/fluorescence imaging was performed as previously described (Brancaccio et al, 2013 (link)), using the LV200 system (Olympus Microscopy, UK). Briefly, SCN explants were sealed into 35 mm dishes with glass bottoms (Mattek, Slovakia) and transferred to the heated stage of an LV200 microscope system equipped with an EM‐CCD camera (Hamamatsu, Japan). For combined bioluminescence and fluorescence, images were taken at a time resolution of 30 min. Fluorescence exposure was 100 ms, and bioluminescence signal was acquired over 29.5 min.
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