Positive test controls include: Mouse liver. The target is usually found in the following locations: Secreted. Immunogen sequence: GLALLSEAVL RGQALLVNSS QPWEPLQLHV DKAVSGLRSL TTLLRALGAQ KEAISPPDAA SAAPLRTITA DTFRKLFRVY SNFLRGKLKL YTGEACRTGD R. Erythropoi