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Officers C. William Zadel Chairman, Chief Executive Officer and President Michael P. Carroll Vice President Douglas B. Jacoby Vice President J. Edward Lary Vice President Francis J. Lunger Vice President, Chief Financial Officer Joanna Nikka Vice President Jeffrey Rudin Vice President, General Counsel Hideo Takahashi Vice President John E. Beard Clerk Directors C. William Zadel Chairman, Chief Executive Officer and President Charles D. Baker 3 Professor of Business Administration Northeastern University, Boston, Massachusetts (Retiring as Director April 22, 1999) Robert C. Bishop, Ph.D. 1 President and Chief Executive Officer AutoImmune, Inc., Lexington, Massachusetts Samuel C. Butler 1 Partner Cravath, Swaine & Moore, New York, New York Robert E. Caldwell 2 Retired Vice President and General Manager Digital Semiconductor Division Digital Equipment Corporation, Hudson, Massachusetts Elaine L. Chao 3 Distinguished Fellow The Heritage Foundation, Washington, D.C. Maureen A. Hendricks 1 Managing Director Salomon Smith Barney, Inc., New York, New York

Mark Hoffman 2 Independent Investor and Consultant Thomas O. Pyle 3 Independent Business Advisor and Corporate Director of Healthcare Organizations John F. Reno 2 Chairman, President and Chief Executive Officer Dynatech Corporation, Burlington, Massachusetts Corporate Offices Millipore Corporation 80 Ashby Road Bedford, Massachusetts 01730-2271 Tel: (781) 533-6000 Fax: (781) 533-3110 Internet: www.millipore.com Subsidiaries and Offices Australia Holland Poland Austria Hong Kong Puerto Rico Belgium Hungary Russia Brazil India Singapore Canada Ireland Spain China Italy Sweden Czech Republic Japan Switzerland Denmark Korea Taiwan Finland Malaysia United Kingdom France Mexico United States Germany Norway Manufacturing Sites Brazil Japan China Puerto Rico France United Kingdom Ireland United States ©1999 Millipore Corporation or an affiliated company. All rights reserved. Printed in U.S.A. 99/23 Lit No. AN462 Millipore, Pellicon, Multiscreen, Millicell, Ultrafree, Durapore, Milli-Q, Integritest, Wafergard, Waferpure and QuickChange are registered trademarks of Millipore Corporation or an affiliated company. M Air T, Aervent, Labscale, ZipTip, MilliWrap, Milliseal, Opticap, Simplicity, AI0, IsoPak, Span, Millipore Chem-Line, Pumpgard, Planargard, Impact, Optimizer and Encompass are trademarks of Millipore Corporation or an affiliated company. Working Mother is a trademark of MacDonald Communications Corporation. CIO is a trademark of International Data Group, INc. Windows is a trademark of Microsoft Corporation. Teflon is a trademark of E.I. duPont de Nemours and Company. All of the officers except Mr. Beard are employed on a full-time basis by Millipore Corporation in the position indicated. Mr. Beard is a partner in the law firm of Ropes & Gray. 1 Member of the Audit and Finance Committee 2 Member of the Management Development and Compensation Committee 3 Member of the Governance and Public Policy Committee SKU-960-AR-99