has part has part has_part characteristic of has modifier synaptic vesicle, recycling pool decreased synaptic vesicle number abnormal synaptic vesicle recycling pool size decreased synaptic vesicle recycling pool size 2026-07-17T20:07:57Z reduction in the quantity of synaptic vesicles belonging to the pool that repopulate vacancies within the readily releasable pool (RRP) of synaptic vesicles, and require more significant stimuli than the RRP in order to release neurotransmitter reduced recycling pool of synaptic vesicles number MP:0015060 abnormal decreased amount