What's the difference between Cytoplasmic pool and Granular storage pool when speaking about neurotransmitters and synaptic cleft. I encountered this here:
Amphetamine’s mechanism of action thus depends on the cytoplasmic, newly synthesized, rapidly metabolized pool of dopamine. Methylphenidate’s mechanism of action depends on the granular storage pool (Brust, 2004)
Brust, J. C. M. (2004). Neurological aspects of substance abuse. Philadelphia, PA, Elsevier.