L1CAM and Parkinson disease: In terms of PD, studies have shown that α‐synuclein, L1CAM, DJ‐1, Tau, and lnc‐RNA‐POU3F3, as well as various miRNAs, including miR‐1, miR‐19b‐3p, miR‐10a‐5p, miR‐153, miR‐409‐3p, miR‐331‐5p, miR‐505, miR‐24, and miR‐195, can be used as potential biomarkers.43