Positive test controls include: PC-12, SH-SY5Y. Immunogen sequence: MRSAAVLALL LCAGQVTALP VNSPMNKGDT EVMKCIVEVI SDTLSKPSPM PVSQECFETL RGDERILSIL RHQNLLKELQ DLALQGAKER AHQQKKHSGF. Chromogranin A (CHGA) is a member of the chromogranin/secretogranin family