synaptophysin

noun
syn·ap·to·phy·sin | \ sə-ˈnap-tə-ˌfī-sᵊn \

Medical Definition of synaptophysin 

: a transmembrane glycoprotein found chiefly in presynaptic vesicles of neurons and neurosecretory granules of neuroendocrine cells

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occurring twice a year or every two years

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