Assertion: amino acid serine | /r/HasProperty | replaced by nonphosphorylatable amino acid
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text: In vitro, the cdk9/cyclin T2 complex immunoprecipitated from differentiating myoblasts can efficiently phosphorylate MyoD.3 To further investigate the relevance of this phosphorylation, we screened a panel of different MyoD point mutants where the serine of putative cdk target sites – proline-directed serine (sp sites) – were replaced by a nonphosphorylatable amino acid (alanine).