Positive test controls include: HepG2. The target is usually found in the following locations: Secreted, extracellular matrix, extracellular space. Immunogen sequence: MLRGPGPGLL LLAVQCLGTA VPSTGASKSK RQAQQMVQPQ SPVAVSQSKP GCYDNGKHYQ INQQWERTYL GNALVCTCY