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colleen colleen
wrote...
Valued Member
Posts: 17077
12 years ago
Compare and contrast cell signalling via receptor serine/threonine kinases and Ras.
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Sunshine ☀ ☼

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wrote...
12 years ago
Receptor serine/threonine kinases act through receptor-regulated Smads and the accessory Smad4. Together, they enter the nucleus as a complex following receptor activation.

Ras is regulated by GAPs and Sos (guanine-nucleotide exchange factor). This in turn activates a cascade of phosphorylation events, resulting in the activation of transcription factors that mediate gene expression.
Biology!
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