The protein encoded by the human RIT2 gene binds to the product of human calmodulin 1 (CALM1), and the latter binds to α-synuclein and microtubule-associated protein tau, suggesting that RIT2 may share the same pathway as SNCA and MAPT in the pathogenesis of PD [26–28]. The gene discussed is RIT2; the disease is Parkinson disease.