PREP and Parkinson disease: Prolyl oligopeptidase (PREP) is mainly cytosolic enzyme involved in peptide bond cleavage that was recently shown to negatively regulate autophagy.5 KYP‐2047 is a small‐molecule inhibitor of PREP having a disease‐modifying effect in the alpha‐synuclein (aSyn) models of Parkinson ́s disease (for review, see Ref.6).