SLC6A3 and Parkinson disease: Dopamine transporter (DaT) scintigraphy with 123I‐N‐ω‐fluoropropyl‐2β‐carboxymethoxy‐3β‐(4‐iodophenyl)nortropane (123I‐FP‐CIT) is useful in the diagnosis of nigrostriatal degenerative diseases such as Parkinson's disease (PD) and dementia with Lewy bodies (DLB).1, 2, 3