PLA2G6 and Parkinsonism: According to the age of onset and clinical features, PLA2G6‐associated neurodegeneration (PLAN) can be categorized into 4 phenotypes: infantile neuroaxonal dystrophy (INAD), atypical neuroaxonal dystrophy (ANAD), adult‐onset dystonia‐parkinsonism (DP), and autosomal recessive early‐onset parkinsonism (AREP).