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Letter

Nature Cell Biology 6, 770–776 (1 August 2004) | doi:10.1038/ncb1152

MLK3 is required for mitogen activation of B-Raf, ERK and cell proliferation

Deborah N. Chadee & John M. Kyriakis

The ERK group of mitogen-activated protein kinases (MAPKs) is essential for cell proliferation stimulated by mitogens, oncogenic ras and raf (ref. 1).