Title says it all.

* induction of LTP: involves NMDA receptors and rise in postsynaptic intracellular calcium
* rise in Ca is a necessary trigger for LTP
* when the postsynaptic membrane is depolarized, Mg2+ is expelled from the NMDAR channel, allowing calcium to enter the cell as well
* most likely not as simple as a threshold in calcium levels, probably has afferent activity contributions as well
* kinases in LTP PKC, CamKII, Fyn (tyrosine kinase)
* attractive hypothesis: LTP is due to maintenance of increased protein kinase activity - lots of evidence supports this, including the fact that after LTP induction kinase activity levels are elevated for half an hour to an hour.

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