 The recovery of the vesicle is referred to as endocytosis and is important to reset the presynaptic cell with new neurotransmitter.Synaptojanin 1 and Synaptojanin 2 are the two main proteins in the synaptojanin family.Synaptojanin 2 can be further subdivided into synaptojanin 2a and synaptojanin 2b.