Positive test controls include: A-549, HeLa, U-251MG, Mouse liver. The target is usually found in the following locations: Nucleus. Immunogen sequence: MCHKNGFPQE GGITAAFLQK RKLRLSKNHR PARAKVTEHV RGTRPGRATA GPAASTRAAG SLFFDRWGNR GPAGCRGSSH LPQQLKFTTS DSC