Immunogen sequence: PAAGAHSSPP KARFLRVPSE HPYLTPSPES PEHWASPSPP SLSDWSESTP SPATATGAMA TTTGALPAQP LPLSVPSSLA QAQTQLGPQP EVTPKRQVLA. NOTCH3 is the third discovered human homologue of the Drosophilia melanogaster type I membrane protein notch. In Drosophili