EXHIBIT 2
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(k) promulgated under the Securities Exchange
Act of 1934, the undersigned agree to the joint filing of a Statement on
Schedule 13D (including any and all amendments thereto) with respect to the
shares of Vysis, Inc. and further agree to the filing of this agreement as an
Exhibit thereto. In addition, each party to this Agreement expressly authorizes
each other party to this Agreement to file on its behalf any and all amendments
to such Statement on Schedule 13D.
Date: October 25, 2001
BP p.l.c.
By: /s/ Xxxxxx Xxxxxxxxx
----------------------
Name: X. X. Xxxxxxxxx
Title: Assistant Company
Secretary
BP America Inc.
By: /s/ X. X. Xxxxxxx
-------------------------
Name: X. X. Xxxxxxx
Title: Corporate Secretary
BP Corporation North America
Inc.
By: /s/ X. X. Xxxxxxx
-------------------------
Name: X. X. Xxxxxxx
Title: Corporate Secretary
Amoco Technology Company
By: /s/ X. X. Xxxxxxx
-------------------------
Name: X. X. Xxxxxxx
Title: Vice President
