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The Raf-1 serine/threonine kinase transmits proliferative and developmental signals to downstream effectors in the mitogen-activated protein kinase cascade. Studies to date have concentrated on its role in growth factor-mediated activation of the cell cycle. We show here that Raf-1 kinase activity is also highly stimulated during mitosis, with an attendant distinctive electrophoretic mobility shift due to hyperphosphorylation. These results suggest that Raf-1 may play a role in traversal of at least two distinct phases of the cell cycle.
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Laird et al. (1995) studied this question.
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