IFNAR1 and cryptosporidiosis: The above data demonstrate differential gene expression profiles between infected intestinal epithelium from Villin. Ifnar1−/− and Ifnar1fl/fl neonates or infected IEC4.1 and IEC4.1-Ifnar1−/− cells, suggesting a strong type I IFN response in intestinal epithelial cells following Cryptosporidium infection.