part of endosome organization synaptic vesicle to endosome fusion GO:0016189 biological_process Fusion of a synaptic vesicle with an endosome. This covers fusion of synaptic vesicles trafficked to the synapse as well as fusion of endocytosed vesicles as part of recycling. It is there for not part of the synaptic vesicle cycle. organelle fusion synaptic vesicle endosomal processing