Positive test controls include: Human serum, Mouse serum. The target is usually found in the following locations: Secreted. Immunogen sequence: VEFWVDGKPR VRKSLKKGYT VGAEASIILG QEQDSFGGNF EGSQSLVGDI GNVNMWDFVL SPDEINTIYL GGPFSPNVLN WRALKYEVQG EVFTKPQLWP.