Exhibit 99.1 - Explanation of Responses
                     ------------


CR Intrinsic Investments directly owns Common Stock of the Issuer and
Convertible Preferred Stock of the Issuer. CR Intrinsic Investors, LLC ("CR
Intrinsic Investors") is the investment manager to CR Intrinsic Investments.
Pursuant to an investment management agreement, CR Intrinsic Investors maintains
investment and voting power with respect to securities held by CR Intrinsic
Investments. Steven A. Cohen, through one or more intermediary holding
companies, controls CR Intrinsic Investors. In accordance with Instruction
4(b)(iv), the entire amount of the Issuer's Common Stock held by CR Intrinsic
Investments is reported herein. Each of CR Intrinsic Investors and Steven A.
Cohen disclaims beneficial ownership of any of the Issuer's securities to which
this report relates except to the extent of their respective indirect pecuniary
interest therein, and this report shall not be deemed an admission that either
of CR Intrinsic Investors or Steven A. Cohen is the beneficial owner of such
securities for purposes of Section 16 of the Securities Exchange Act of 1934 or
for any other purposes.