Positive test controls include: HT-29, SGC-7901. Immunogen sequence: MYVGYVLDKD SPVYPGPARP ASLGLGPQAY GPPAPPPAPP QYPDFSSYSH VEPAPAPPTA WGAPFPAPKD DWAAAYGPGP AAPAASPASL AFGPPPDFSP. CDX1, or caudal type homeobox 1, is a gene encoding a homeodomain transcri