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Neuropeptide Y (NPY) is a transmitter molecule in nerve system, and it was an over 4-kDa large peptide with the C-terminal end amidation. NPY is biosynthesized through many maturation processes from a large pre-pro-peptide with peptide-cleavages and amidation that is important to study the biosynthesis regulation. Previously, it was reported that cathepsin L participates in the production of NPY and that cathepsin L generates both of amidated and non-amidated NPYs. However, the non-amidated NPY (NPY-COOH) has not been reported in brain