synaptojanin [ PIP(2) phosphatase,Synj2 protein,synaptojanin 2,synaptojanin-1,synaptojanin-2,synaptojanin1 ] 145-kDa nerve terminal protein with inositol-5-phosphatase (PtdInsP3 5-phosphatase) activity; binds to SH3 domain of amphiphysin; synaptojanin-2 is an isoenzyme; amino acid sequence in first source