ERK
2022-04-12: Serine-Threonine Protein Kinase reference:
ERK (Extracellular signal-regulated kinases) #
Sometimes, as ‘classical MAPK’ it is synonymous with MAPK, since ERK was the first to be discovered.
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Subtypes (make it even more confusing af): MAPK3 (aka ERK1) & MAPK1 (aka ERK2) 
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Activated by Protein Kinase A, I believe. 
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Inhibited by PP1 and PP2A. 
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Making new connections: role of ERK/MAP kinase signaling in neuronal plasticity 
