Tg(Ins2-tTA)1Doi encodes the tetracycline regulatable transactivator (tTA) regulated by the rat insulin promoter (Ins2, commonly designated RIP), and is expressed in the pancreatic beta cells. Mice hemizygous for this transgenic insert are viable, fertile, normal in size, display normal NOD diabetes onset, but do not display any other gross physical or behavioral abnormalities. When transgenic mice are mated to a second transgenic strain carrying the target gene regulated by the tetO responsive elements, expression of the target gene is turned off by the tetracycline analog, doxycycline (dox). Dox can be administered orally in the food or water. This strain provides a Tet-Off tool that permits the inducible expression of genes in the pancreatic beta cells during various stages of diabetes development.

These NOD.RIP-tTA mice express a transgene containing the  tetracycline transactivator (tTA) that permits the inducible expression of genes in pancreatic beta cells.

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