The function of USP26 (ubiquitin specific peptidase 26, Ensembl gene identifier ENSG00000134588) is as follows. Deubiquitinase regulating several biological processes through the deubiquitination of components of these processes (PubMed:20501646, PubMed:28839133). Involved in somatic cell reprogramming through the 'Lys-48'-linked deubiquitination and stabilization of CBX4 and CBX6, two components of the polycomb- repressive complex 1 (PRC1) (PubMed:28839133). Also deubiquitinates and probably stabilizes the androgen receptor (AR), regulating the androgen receptor signaling pathway (PubMed:20501646). May play a role in spermatogenesis (PubMed:34202084). {ECO:0000269|PubMed:20501646, ECO:0000269|PubMed:28839133, ECO:0000269|PubMed:34202084}.