The NR1D1 (REV-ERBA) gene is transcribed to yield mRNA and the mRNA is translated to yield NR1D1 protein (Miyajima et al. 1989, Adelmant et al. 1996, also inferred from mouse homologs). In mouse the Rev-erba gene shows circadian expression due to transactivation by the BMAL1:CLOCK (ARNTL:CLOCK) heterodimer. REV-ERBA binds the promoter of its own gene and represses its own expression (Adelmant et al. 1996).