The parasitic roundworm Nippostrongylus brasiliensis affecting rodents is a good model of human-infecting hookworm. A protein called fatty acid and retinol-binding protein 1 (FAR-1) released by the worm is understood to modulate the host's anti-worm immune response, but its effect on the worm itself has been unclear. Here, researchers find FAR1 plays a role in the worm's growth, development and reproduction by regulating lipid metabolism
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