This plasmid ("Original Material") contains the Tetracycline controllable expression system (the "Tet Technology"). The Tet Technology IP portfolio is proprietary to TET Systems GmbH & Co. KG ("Tet Systems") and comprises a series of patents including U.S. Patent Nos. 5,464,758, 5,814,618, and European Patent EP 0804565 and corresponding patent claims outside these regions. The purchaser of the Original Material (Recipient) is granted an automatic license to use the Tet Technology only for internal, academic research purposes, which license specifically excludes the right to sell, or otherwise transfer, the Tet Technology or its component parts to third parties. Recipient whose research using the Tet Technology is sponsored by for-profit organizations, which shall receive ownership to any data or results stemming from the sponsored research, shall need a commercial license agreement from Tet Systems in order to use the Tet Technology. Recipient may transfer derivative materials to other scientists at non-profit institutions ("Collaborator") for non-commercial, internal, and academic research if, and only if, Collaborator has obtained a MTA from Tet Systems (www.tetsystems.com/ip-licensing/licensing/not-for-profit-research). Recipient may deposit plasmids derived from Original Materials with Addgene, if and only if permitted by a current license between Tet Systems and Addgene, and solely for the purpose of distributing to other academic and non-profit institutions. Transfer of the Original Material or any derivatives thereof that comprise the Tet Technology or its component parts to any for-profit entity without the prior written approval of Tet Systems is not permitted. In accepting this license, all users acknowledge that the Tet Technology is experimental in nature. TET Systems makes no warranties, express or implied or of any kind, and hereby disclaims any warranties, representations, or guarantees of any kind as to the Tet Technology, patents, or products.