Images provided by Claire Anderson. As insufficient information was provided to verify sequence used to synthesize probe, the sequence above was obtained from NCBI (accession number: NM_001038652.1 ). Related paper: Begbie J, Doherty P, Graham A. Cannabinoid receptor, CB1, expression follows neuronal differentiation in the early chick embryo. J Anat. 2004 Sep;205(3):213-8.