Immediate early gene markers for of neural activity do not persist long enough to serve as markers for long-term memory engram cells.

Neurons that overexpress CREB win in the competition for becoming engram cells because when activated by the behavioral experience, CREB targets more memory genes that other cells.

A neuronal ensemble is quite different from a cell assembly.

Karl Lashley invented the term engram.

Simon’s term ecphory is another word for engram.

Immediate early genes can serve as markers or tags for neuron activated by a behavioral experience.

If a molecule is critical for long-term memory, it should also be critical for short-term memory.

Regarding the TetTag mouse, if a neuron expresses the marker a time of the behavioral retrieval test then it can be concluded that it is an engram cell.

Richard Simon invented the term engram.

The term ecphory is roughly equivalent to the term retrieval.