Honegger, A. M. et al. Evidence that autophosphorylation of solubilized receptors for epidermal growth factor is mediated by intermolecular cross-phosphorylation. Proceedings of the National ...
As autophosphorylation cannot account for all the N-terminal phosphorylation that is required 15, this process probably requires an as-yet-unidentified protein kinase downstream of cyclin B–Cdk1.