A number of ELISA Kits are available that target m-rigui, an alias of the protein, period circadian regulator 1. The human protein is encoded by the gene PER1. The protein's cellular localization is indicated to be cytoplasmic and nuclear. Additional synonyms or past names for this protein may include: PER, RIGUI, hPER. Homology is conserved in other species, such as Mouse, Rat, Frog.