Positive test controls include: HeLa, U-251MG, K-562, Rat testis. The target is usually found in the following locations: Nucleus. Immunogen sequence: AEPKVNRGKA GVKRSAAEMY GSVTEHPSPS PLLSSSFDLD YDFQRDYYDR MYSYPARVPP PPPIARAVVP SKRQRVSGNT SRRGKSGFNS KSGQ