Description: The monoclonal antibody eBioP4D1 (p4D1) recognizes ubiquitin, a small 8Ka protein. Ubiquitin units are linked to proteins via a ubiquitination process, thereby signaling the protein for degradation by the 26S proteosome. The process of ubiquitination plays a role in differentiation, cell cycle progression, apoptosis and disease progression. For example, neuronal inclusions called Lewis bodies from Parkinson patients are rich in ubiquitin.