SPFH1 and SPFH2 mediate the ubiquitination and degradation of inositol 1,4,5-trisphosphate receptors in muscarinic receptor-expressing HeLa cells. by Wang, Y, Pearce, M, Sliter, D, Olzmann, J, Christianson, J, Kopito, R, Boeckmann, S, Gagen, C, Leichner, G, Roitelman, J, Wojcikiewicz, R