Positive test controls include: HepG2. The target is usually found in the following locations: Secreted, extracellular space. Immunogen sequence: IVEGSDAEIG MSPWQVMLFR KSPQELLCGA SLISDRWVLT AAHCLLYPPW DKNFTENDLL VRIGKHSRTR YERNIEKISM LEKIYIHPRY NWRENLDRD