Protein kinase B (PKB), also known as Akt, is the collective name of a set of three serine/threonine-specific protein kinases that play key roles in multiple cellular processes such as glucose metabolism, apoptosis, cell proliferation, transcription, and cell migration.

These three genes are referred to as

and encode the RAC alpha, beta, and gamma serine/threonine protein kinases respectively. The terms PKB and Akt may refer to all three genes collectively, but sometimes are used to refer to PKB alpha and Akt1 alone. [https://en.wikipedia.org/wiki/Protein_kinase_B].

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