UCHL1 and parathyroid gland carcinoma: For example, protein gene product 9.5 (PGP9.5), encoded by the ubiquitin carboxyl-terminal esterase L1 (UCHL1) gene has been shown to be upregulated in the majority of parathyroid carcinomas based on gene expression profiling, and the results were verified by immunohistochemistry [29].