Positive test controls include: A-549, Mouse lung, Mouse brain, Rat lung. Immunogen sequence: KAENSVAAKS GGCFPGSATV HLEQGGTKLV KDLRPGDRVL AADDQGRLLY SDFLTFLDRD EGAKKVFYVI ETLEPRERLL LTAAHLLFVA PHNDS. Sonic Hedgehog (SHH), which is expressed only during e