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Hu\n                    <jats:italic>et al<\/jats:italic>\n                    . found that small proline-rich protein 2A (SPRR2A) is a bactericidal protein produced in the gut that targets Gram-positive bacteria and is phylogenetically distinct from all other known AMPs (see the Perspective by Harris and Wickramasinghe). SPRR2A production is selectively enhanced by type 2 cytokines such as interleukin-4 and -13 that are elicited by helminth infection. Mice lacking SPRR2A are unable to prevent intestinal bacteria from invading the intestinal barrier after helminths damage the intestinal epithelium. 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