“CLOCK, BMAL1, and MYC are all transcription factors that share a highly similar basic helix-loop-helix (bHLH) protein domain, allowing these proteins to recognize the same promoter element, the enhancer box (E-box) sequence, in the regulatory regions of target genes.”
https://www.nature.com/articles/s41591-018-0271-8?fbclid=IwAR01C2Z4J5lxVYDLhxIb9dPb3fhNSZSxwimZvhHaJ4n3-nVPpkt2PNqoukk