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We have previously demonstrated that, in COS-1 cells, inhibition of calmodulin increases Ras-GTP levels although it decreases Raf-1 activity and consequently MAPK. The present study analyzes the role of calmodulin in the regulation of Raf-1. First we show, using FRET microscopy, that inhibition of Raf-1 was not a consequence of a decreased interaction between H-Ras and Raf-1. Besides, the analysis...
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