Biosource International Inc Watch

from SC 13D/A 1 page Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Biosource Intl Inc. Gamco Asset Management Inc. 10/06/05 25,000- 12.5000 10/06/05 153,915- 12.5000 10/04/05 1,240 12.5000 10/03/05 1,000 12.5000 9/30/05 551 12.5000 9/28/05 817 12.5000 9/27/05 2,580 12.5000 9/26/05 256 12.5000 9/23/05 803 12.5000 Gabelli Securities, Inc. Gabelli Associates Ltd 10/06/05 173,599- 12.5000 10/05/05 4,380 12.5000 10/03/05 2,600 12.5000 9/29/05 360 12.5000 Gabelli Associates Fund II 10/06/05 7,000- 12.5000 10/03/05 1,000 12.5000 Gabelli Associates Fund 10/06/05 159,517- 12.5000 10/05/05 5,000 12.5000 10/03/05 5,000 12.5000 9/22/05 32 12.5000 Mjg Associates, Inc. Gabelli Fund, Ldc 10/06/05 2,000- 12.5000 Gabelli Funds, LLC. Gabelli Abc Fund 10/06/05 152,200- 12.5000 (1) the Transactions on 10/6/05 Were in Connection With the Merger Described in Item 5 of This Amendment to Schedule 13d. Under the Terms of the Merger, the Issuer's Shareholders Received $12.50 in Cash for Each Share of Issuer's Common Stock. Unless Otherwise Indicated, All Other Transactions Were Effected on the NASDAQ National Market. (2) Price Excludes Commission

from SC 13D/A 1 page Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Biosource Intl Inc. Gamco Asset Management Inc. 9/19/05 2,000 12.5000 9/15/05 1,000 12.5000 9/13/05 3,000 12.5000 9/12/05 3,000 12.5000 9/09/05 4,000 12.5000 9/08/05 5,000 12.5000 9/07/05 238 12.4900 8/25/05 1,153 12.4800 8/24/05 1,200 12.4904 8/24/05 6,520 12.5154 8/24/05 3,800 12.4700 Gabelli Securities, Inc. Gabelli Associates Ltd 9/19/05 2,048 12.5000 9/14/05 3,740 12.5000 9/13/05 4,000 12.5000 9/12/05 4,000 12.5000 9/09/05 3,000 12.5000 9/08/05 1,896 12.5000 8/29/05 340 12.4900 8/24/05 6,200 12.4700 8/24/05 4,000 12.4904 8/22/05 1,800 12.4700 Gabelli Associates Fund II 9/08/05 1,000 12.5000 Gabelli Associates Fund 9/19/05 4,000 12.5000 9/13/05 3,000 12.5000 9/12/05 3,000 12.5000 9/09/05 3,000 12.5000 9/08/05 4,000 12.5000 8/24/05 9,710 12.4904 8/22/05 1,900 12.4700 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NASDAQ National Market. (2) Price Excludes Commission

from SC 13D/A 1 page <page> Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1(k) Promulgated Under the Securities Exchange Act of 1934, as Amended, the Undersigned Hereby Agree to the Joint Filing With All Other Reporting Persons (As Such Term Is Defined in the Schedule 13d Referred to Below) and Robert J. Weltman on Behalf of Each of Them of a Statement on Schedule 13d (Including Amendments Thereto) With Respect to the Common Stock, Par Value $0.001 Per Share, of Biosource International, Inc., a Delaware Corporation, and That This Agreement May Be Included as an Exhibit to Such Joint Filing. This Agreement May Be Executed in Any Number of Counterparts, All of Which Taken Together Shall Constitute One and the Same Instrument. in Witness Whereof, the Undersigned Hereby Execute This Agreement as of the 22nd Day of September, 2000. Genstar Capital LLC By: /S/ Jean-Pierre L. Conte Name: Jean-Pierre L. Conte Its: Managing Member Genstar Capital Partners II, L.P. By: Genstar Capital LLC, Its General Partner By: /S/ Jean-Pierre L. Conte Name: Jean-Pierre L. Conte Its: Managing Member Stargen II LLC By: /S/ Jean-Pierre L. Conte Name: Jean-Pierre L. Conte Its: Member /S/ Jean-Pierre L. Conte Jean-Pierre L. Conte /S/ Jean-Pierre L. Conte Jean-Pierre L. Conte Attorney-In-Fact for Richard F. Hoskins /S/ Jean-Pierre L. Conte Jean-Pierre L. Conte Attorney-In-Fact for Richard D. Paterson /S/ Jean-Pierre L. Conte Jean-Pierre L. Conte Attorney-In-Fact for Robert J. Weltman

from S-3/A ~50 pages Underwriting Agreement

from 8-A12G ~50 pages Rights Agreement, With Exhibits

from SB-2/A ~50 pages Form of Underwriting Agreement