Sommer, S., Weikart, N. D., Brockmeyer, A., Janning, P., & Mootz, H. D. (2011). Expanded Click Conjugation of Recombinant Proteins with Ubiquitin-Like Modifiers Reveals Altered Substrate Preference of SUMO2-Modified Ubc9. Angewandte Chemie International Edition, 50(42): 1, pp. 9888-9892. Retrieved from http://dx.doi.org/10.1002/anie.201102531.