(B) Top image: Dual-channel smFISH targeting Bmal1 and Cry1 simultaneously, taken at 17h after Dex synchronisation. Blue, nuclei stained with DAPI; green dots, Bmal1 transcripts; red, Cry1 transcripts. Bottom image: Dual-channel smFISH targeting Nr1d1 and Cry1 simultaneously, taken at 25h after Dex synchronisation. Blue, nuclei stained with DAPI; green dots, Nr1d1 transcripts; red, Cry1 transcripts. Scale bar: 20μm. 