The Toll genes encode members of the Toll-like receptor class of proteins. ("Toll" is German for "amazing" or "mad".) Toll genes were originally identified in the fruit fly Drosophila melanogaster in 1985,  , and cloned in 1988. Since then, eleven known mammalian Toll genes have been identified.
In flies, Toll was first identified as a gene important in embryogenesis in establishing the dorsal-ventral axis. In 1996, Toll was found to have a role in the fly's immunity to fungal infections. Both mammalian and invertebrate Toll genes are required for innate immunity.
- "toll - Wiktionary, das freie Wörterbuch – Das Wikiwörterbuch". Retrieved 2007-11-10.
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