Ubiquitin carboxyl-terminal hydrolase isozyme L1, UCH-L1, thiol protease, peptidase C12 family, ubiquitin precursors, ubiquitination, neurons, neuroendocrine system, tumor, Ubl conjugation pathway, cytoplasm, endoplasmic reticulum, neurodegeneration, Parkinson disease, hydrolase, ligase, acetylation, cell death, MAP kinase activity, catabolism, and ubiquitin