Synaptophysin (SypI), also referred as p38 (1), constitutSyp I contains four transmembrane regions and can be phosphorylated on its cytoplasmic C-terminus by both serine/threonine and tyrosine kinases (2). In addition to syp I, synaptic vesicles contain a highly homologous membrane protein named synaptoporin or synaptophysin II (Syp II) (3). While Syp I is ubiquitously expressed and present in virtually all synapses whereas Syp II is expressed at high levels only in selected neurons (4). es approximately 7% of the total vesicle protein and is selectively associated with small synaptic vesicles (SSVs)
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