- Ubiquitin-dependent degradation of Smad2 is increased in the glomeruli of rats with anti-thymocyte serum nephritis. Togawa, A., Yamamoto, T., Suzuki, H., Fukasawa, H., Ohashi, N., Fujigaki, Y., Kitagawa, K., Hattori, T., Kitagawa, M., Hishida, A. Am. J. Pathol. (2003)