Sol., soluble; Ab, antibody. ACKNOWLEDGMENTS We thank Gabriele Drescher for technical assistance with the preparation of samples for electron microscopy. for some retroviruses (1), or with endosomal membranes after endocytosis, as is the case for influenza computer virus (2). The


S. endoplasmic reticulum (ER) is enough for GPICGnT activation. Of the six subunits of the GPICwhere multiple subunits were identified as inhibiting Ras2. Fluorescence resonance energy transfer (FRET) studies indicate a specific physical conversation between CaRas1 and CaGpi2 in the