Except as expressly provided herein, neither this Agreement nor any term hereof may be amended, waived, discharged or terminated other than by a written instrument referencing this Agreement and signed by the Company and the Investors holding a majority of the Common Stock issued or issuable upon conversion of the Shares issued pursuant to this Agreement (excluding any of such shares that have been sold to the public or pursuant to Rule 144). Any such amendment, waiver, discharge or termination effected in accordance with this paragraph shall be binding upon each holder of any securities purchased under this Agreement at the time outstanding (including securities into which such securities have been converted or exchanged or for which such securities have been exercised) and each future holder of all such securities.