Positive test controls include: Mouse brain, Rat brain. The target is usually found in the following locations: Nucleus. Immunogen sequence: LRNHAVGPST AMPGGHGDMH GIIGPSHNGA MGGLGSGYGT GLLSANRHSL MVGTHREDGV ALRGSHSLLP NQVPVPQLPV QSATSPDLNP PQDPYRGMPP G.