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In polarized cells, signal transduction by cholera toxin (CT) requires apical endocytosis and retrograde transport into Golgi cisternae and likely endoplasmic reticulum (ER) (Lencer et al., J. Cell Biol. 131, 951-962 (1995)). We have recently found that the toxin's apical membrane receptor ganglioside GM1 acts specifically in this signal transduction pathway, likely by coupling CT with caveolae or...
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