TomoTherapy and its directors and executive officers and other persons may be deemed to be participants in the solicitation of proxies in respect of the proposed transaction. Information regarding TomoTherapy's directors and executive officers is available in TomoTherapy's proxy statement for its 2010 annual meeting of shareholders and TomoTherapy's Annual Report on Form 10-K for the year ended December 31, 2010, as amended, which were filed with the SEC on March 22, 2010, March 3, 2011, and April 15, 2011, respectively. Other information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, are contained in the proxy statement and other relevant materials filed with the SEC.