Positive Samples: A-549, A-431, Mouse stomach Immunogen sequence: MIARQQCVRG GPRGFSCGSA IVGGGKRGAF SSVSMSGGAG RCSSGGFGSR SLYNLRGNKS ISMSVAGSRQ GACFGGAGGF GTGGFGGGFG GSFSGKGGPG. Cytokeratins are a subfamily of intermediate filament proteins and are charac