ZUP1 and ovarian neoplasm: Most DUBs are cysteine proteases and are further divided into six subclasses: ubiquitin‐specific proteases (USPs), ubiquitin C‐terminal hydrolases (UCHs), ovarian tumour proteases (OTUs), machado–Josephin domain proteases (MJDs), the motif interacting with the ubiquitin‐containing DUB family (MINDY) and zinc finger with a UFM1‐specific peptidase domain protein/zinc finger containing Ub peptidase 1 (ZUFSP/ZUP1).