Ubiquitin; there is no doubt that ubiquitin is a ''lucky'' protein. It is lucky in many ways: lucky for scientific progress, lucky for biomedical scientists and lucky for life! If you have already done so, why don't you get lucky and look for a role of ubiquitin in your experimental system. As Acram Hershko has said ''there is plenty to go around''! (Previously quoted by Mayer et al. [1].).