JOINT FILING AGREEMENT
This will confirm the agreement by and between the undersigned
that the Schedule 13D filed on or about this date and any amendments
thereto with respect to beneficial ownership by the undersigned of shares
of the Common Stock, par value $.001 per share, of Vysis, Inc. is being
filed on behalf of each of the undersigned under the Securities Exchange
Act of 1934, as amended. This agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.
Dated: November 1, 2001
XXXXXX LABORATORIES
By: /s/ XXXXXXX X. XXXXXXXX
----------------------------
Name: Xxxxxxx X. Xxxxxxxx
Title: Executive Vice President,
Medical Products
RAINBOW ACQUISITION CORP.
By: /s/ XXXXXX X. XXXXXXX
---------------------------
Name: Xxxxxx X. Xxxxxxx
Title: Vice-President
