With reference to glutamate, outline the processes involved in successful neural transmission once the neural impulse has reached the axon terminal. In your response, refer to the lock-and-key process. You may use a labelled diagram.

Investigator a has biological specimens that are coded and linked to identifiers of the source individuals. investigator a provides the specimens to investigator b but does not provide the individual identifiers. investigator b agrees not to re-identify the source individuals. is investigator b's research using the biospecimens human subjects research according to the definition of human subjects research in the federal regulations?