1. Pryer, N. K., Wuestehube, L. J. & Schekman, R. Vesicle-mediated protein sorting. Annu. Rev. Biochem. 61, 471–516 (1992).
2. Gething, M. J. & Sambrook, J. Protein folding in the cell. Nature 355, 33–45 (1992).
3. Kopito, R. R. ER quality control: the cytoplasmic connection. Cell 88, 427–430 (1997).
4. Biederer, T., Volkwein, C. & Sommer, T. Degradation of subunits of the Sec61p complex, an integral component of the ER membrane, by the ubiquitin-proteasome pathway. EMBO J. 15, 2069–2076 (1996).
5. Hiller, M. M., Finger, A., Schweiger, M. & Wolf, D. H. ER degradation of a misfolded luminal protein by the cytosolic ubiquitin-proteasome pathway. Science 273, 1725–1728 (1996).