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Where should SMAD2 bind in order to carry out its receptor mediated phosphorylation?

Where should SMAD2 bind in order to carry out its receptor mediated phosphorylation? Correct Answer SMAD anchor for receptor activation (SARA)

SMAD2 receptor-mediated phosphorylation takes place when SMAD2 is bound to SMAD anchor for receptor activation (SARA). This can be observed in early endosomes, especially in the mitochondria.

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