Form 4
Exhibit 99.2 - Footnote Disclosure

(1)  Represents securities held directly by St. Paul Venture
Capital VI, LLC, which is managed by St. Paul Venture Capital,
Inc.  St. Paul Venture Capital, Inc. has delegated to a
four-member investment committee voting and investment power
over the shares which it manages.  St. Paul Fire and Marine
Insurance Company, a wholly owned subsidiary of The St. Paul
Companies, Inc., has appointed a majority of the members of
the board of directors of St. Paul Venture Capital, Inc. and
the board of directors of St. Paul Venture Capital VI, LLC,
and owns a controlling interest of St. Paul Venture Capital
VI, LLC. The St. Paul Companies, Inc. owns a controlling
interest of St. Paul Venture Capital, Inc.  Each of St. Paul
Venture Capital, Inc., St. Paul Fire and Marine Insurance
Company and The St. Paul Companies, Inc. may be deemed to be
an indirect beneficial owner of the reported securities.
Each of St. Paul Venture Capital, Inc., St. Paul Fire and
Marine Insurance Company and The St. Paul Companies, Inc.
disclaims any beneficial ownership of the reported securities,
except to the extent of any pecuniary interest therein.  This
report shall not be deemed an admission that any of the
reporting persons is the beneficial owner of such securities
for purposes of Section 16 or for any other purpose.

(2)  Each share of Series A, Series B and Series D Convertible
Preferred Stock automatically converted into approximately
0.2857 shares of Common Stock upon the closing of the Issuer's
initial public offering, and each share of Series C Convertible
Preferred Stock automatically converted into approximately
0.4024 shares of Common Stock upon the closing of the Issuer's
initial public offering.

(3)  Represents securities held directly by Windamere, LLC.
Voting and investment power over the shares are generally held
by the managing member of Windamere, LLC; however, investments
or dispositions in excess of certain amounts must be approved
by the board of directors of Windamere, LLC.  St. Paul Venture
Capital, Inc. has appointed a majority of the members of the
board of directors of Windamere, LLC.  St. Paul Fire and Marine
Insurance Company, a wholly owned subsidiary of The St. Paul
Companies, Inc., has appointed a majority of the members of
the board of directors of St. Paul Venture Capital, Inc.  The
St. Paul Companies, Inc. owns a controlling interest of St.
Paul Venture Capital, Inc.  St. Paul Fire and Marine Insurance
Company owns a controlling interest of Windamere, LLC.  Each
of St. Paul Venture Capital, Inc., St. Paul Fire and Marine
Insurance Company and The St. Paul Companies, Inc. may be
deemed to be an indirect beneficial owner of the reported
securities.  Each of St. Paul Venture Capital, Inc., St.
Paul Fire and Marine Insurance Company and The St. Paul
Companies, Inc. disclaims any beneficial ownership of the
reported securities, except to the extent of any pecuniary
interest therein.  This report shall not be deemed an admission
that any of the reporting persons is the beneficial owner of
such securities for purposes of Section 16 or for any other
purpose.

(4)  Represents securities held directly by St. Paul Venture
Capital Affiliates Fund I, LLC, which is managed by St. Paul
Venture Capital, Inc.  St. Paul Venture Capital, Inc. has
delegated to a four-member investment committee voting and
investment power over the shares which it manages.  St. Paul
Fire and Marine Insurance Company, a wholly owned subsidiary
of The St. Paul Companies, Inc., has appointed a majority of
the members of the board of directors of St. Paul Venture
Capital, Inc.  The St. Paul Companies, Inc. owns a controlling
interest of St. Paul Venture Capital, Inc.  Each of St. Paul
Venture Capital, Inc., St. Paul Fire and Marine Insurance
Company and The St. Paul Companies, Inc. may be deemed to be
an indirect beneficial owner of the reported securities.
Each of St. Paul Venture Capital, Inc., St. Paul Fire and
Marine Insurance Company and The St. Paul Companies, Inc.
disclaims any beneficial ownership of the reported securities,
except to the extent of any pecuniary interest therein.  This
report shall not be deemed an admission that any of the
reporting persons is the beneficial owner of such securities
for purposes of Section 16 or for any other purpose.

(5)  Represents securities held directly by St. Paul Venture
Capital IV, LLC, which is managed by St. Paul Venture Capital,
Inc.  St. Paul Venture Capital, Inc. has delegated to a
four-member investment committee voting and investment power
over the shares which it manages.  St. Paul Fire and Marine
Insurance Company, a wholly owned subsidiary of The St. Paul
Companies, Inc., has appointed a majority of the members of
the board of directors of St. Paul Venture Capital, Inc. and
the board of directors of St. Paul Venture Capital IV, LLC,
and owns a controlling interest of St. Paul Venture Capital IV,
LLC.  The St. Paul Companies, Inc. owns a controlling interest
St. Paul Venture Capital, Inc.  Each of St. Paul Venture Capital,
Inc., St. Paul Fire and Marine Insurance Company and The St.
Paul Companies, Inc. may be deemed to be an indirect beneficial
owner of the reported securities.  Each of St. Paul Venture
Capital, Inc., St. Paul Fire and Marine Insurance Company and
The St. Paul Companies, Inc. disclaims any beneficial ownership
of the reported securities, except to the extent of any pecuniary
interest therein.  This report shall not be deemed an admission
that any of the reporting persons is the beneficial owner of such
securities for purposes of Section 16 or for any other purpose.

(6)  Represents securities held directly by St. Paul Venture
Capital V, LLC, which is managed by St. Paul Venture Capital,
Inc.  St. Paul Venture Capital, Inc. has delegated to a
four-member investment committee voting and investment power
over the shares which it manages.  St. Paul Fire and Marine
Insurance Company, a wholly owned subsidiary of The St. Paul
Companies, Inc., has appointed a majority of the members of
the board  of directors of St. Paul Venture Capital, Inc. and
the board of directors of St. Paul Venture Capital V, LLC, and
owns a controlling interest of St. Paul Venture Capital V, LLC.
The St. Paul Companies, Inc. owns a controlling interest St.
Paul Venture Capital, Inc. Each of St. Paul Venture Capital,
Inc., St. Paul Fire and Marine Insurance Company and The St.
Paul Companies, Inc. may be deemed to be an indirect beneficial
owner of the reported securities.  Each of St. Paul Venture
Capital, Inc., St. Paul Fire and Marine Insurance Company and
The St. Paul Companies, Inc. disclaims any beneficial ownership
of the reported securities, except to the extent of any pecuniary
interest therein.  This report shall not be deemed an admission
that any of the reporting persons is the beneficial owner of
such securities for purposes of Section 16 or for any other
purpose.

(7)  Represents securities held directly by Fog City Fund, LLC.
Voting and investment power over the shares are generally held
by the managing member of Fog City Fund, LLC; however, investments
or dispositions in excess of certain amounts must be approved by
the board of directors of Fog City Fund, LLC.  St. Paul Venture
Capital, Inc. has appointed a majority of the members of the
board of directors of Fog City Fund, LLC.  St. Paul Fire and
Marine Insurance Company, a wholly owned subsidiary of The St.
Paul Companies, Inc., has appointed a majority of the members
of the board of directors of St. Paul Venture Capital, Inc.
The St. Paul Companies, Inc. owns a controlling interest St.
Paul Venture Capital, Inc.  St. Paul Fire and Marine Insurance
Company owns a controlling interest of Fog City Fund, LLC. Each
of St. Paul Venture Capital, Inc., St. Paul Fire and Marine
Insurance Company and The St. Paul Companies, Inc. may be deemed
to be an indirect beneficial owner of the reported securities.
Each of St. Paul Venture Capital, Inc., St. Paul Fire and Marine
Insurance Company and The St. Paul Companies, Inc. disclaims
any beneficial ownership of the reported securities, except to
the extent of any pecuniary interest therein.  This report shall
not be deemed an admission that any of the reporting persons is
the beneficial owner of such securities for purposes of Section
16 or for any other purpose.

(8)  Represents securities held directly by Windamere II, LLC.
Voting and investment power over the shares are generally held
by the managing member of Windamere II, LLC; however, investments
or dispositions in excess of certain amounts must be approved by
the board of directors of Windamere II, LLC.  St. Paul Venture
Capital, Inc. has appointed a majority of the members of the
board of directors of Windamere II, LLC.  St. Paul Fire and
Marine Insurance Company, a wholly owned subsidiary of The St.
Paul Companies, Inc., has appointed a majority of the members
of the board of directors of St. Paul Venture Capital, Inc.
The St. Paul Companies, Inc. owns a controlling interest St.
Paul Venture Capital, Inc.  St. Paul Fire and Marine Insurance
Company owns a controlling interest of Windamere II, LLC.  Each
of St. Paul Venture Capital, Inc., St. Paul Fire and Marine
Insurance Company and The St. Paul Companies, Inc. may be deemed
to be an indirect beneficial owner of the reported securities.
Each of St. Paul Venture Capital, Inc., St. Paul Fire and Marine
Insurance Company and The St. Paul Companies, Inc. disclaims any
beneficial ownership of the reported securities, except to the
extent of any pecuniary interest therein.  This report shall not
be deemed an admission that any of the reporting persons is the
beneficial owner of such securities for purposes of Section 16
or for any other purpose.

(9)  Represents securities held directly by Windamere III, LLC.
Voting and investment power over the shares are generally held
by the managing member of Windamere III, LLC; however,
investments or dispositions in excess of certain amounts must
be approved by the board of directors of Windamere III, LLC.
St. Paul Venture Capital, Inc. has appointed a majority of the
members of the board of directors of Windamere III, LLC.  St.
Paul Fire and Marine Insurance Company, a wholly owned
subsidiary of The St. Paul Companies, Inc., has appointed a
majority of the members of the board of directors of St. Paul
Venture Capital, Inc.  The St. Paul Companies, Inc. owns a
controlling interest St. Paul Venture Capital, Inc.  St. Paul
Fire and Marine Insurance Company owns a controlling interest
of Windamere III, LLC.  Each of St. Paul Venture Capital, Inc.,
St. Paul Fire and Marine Insurance Company and The St. Paul
Companies, Inc. may be deemed to be an indirect beneficial
owner of the reported securities.  Each of St. Paul Venture
Capital, Inc., St. Paul Fire and Marine Insurance Company and
The St. Paul Companies, Inc. disclaims any beneficial ownership
of the reported securities, except to the extent of any pecuniary
interest therein.  This report shall not be deemed an admission
that any of the reporting persons is the beneficial owner of
such securities for purposes of Section 16 or for any other
purpose.

(10)  Prior to the closing of the Issuer's initial public
offering, the Warrant was exercisable as to 70,368 shares of
Series C Convertible Preferred Stock at an exercise price of
$2.43, upon the closing of the Issuer's initial public offering,
the Warrant is exercisable as to 28,315 shares of Common Stock at
an exercise price of $6.0386.

(11)  Prior to the closing of the Issuer's initial public
offering, the Warrant was exercisable as to 41,152 shares of
Series C Convertible Preferred Stock at an exercise price of
$2.43, upon the closing of the Issuer's initial public offering,
the Warrant is exercisable as to 16,560 shares of Common Stock at
an exercise price of $6.0386.