Positive test controls include: Mouse brain. The target is usually found in the following locations: Nucleus. Immunogen sequence: LPLAHPSLQR NSMSPGVTHR PPSAGNTGGL MGGDLTSGAG TSAGNGYGNP RNSPGLLVSP GNLNKNMQAK SPPPMNLGMN NRKPDLRVLI PPGSKNTMPS VSEDVDLLLN QRI