Synonyms : Ubiquitin-Activating Enzyme, Ubiquitin-Activating Enzyme E1, Ubiquitination Activating Enzyme E1, Enzyme E1, Ubiquitin-Activating, Enzyme, Ubiquitin-Activating, Enzymes, Ubiquitin-Activating, Ubiquitin Activating Enzyme, Ubiquitin Activating Enzyme E1