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1 NAME OF REPORTING PERSON - State Treasurer, State of Michigan IRS IDENTIFICATION - 38-2836023 2 CHECK IF MEMBER OF A GROUP - Not applicable 3 SEC use only 4 CITIZENSHIP - State of Michigan 5 SOLE VOTING POWER - 1,338,724 (these shares included in item 7 below) 6 SHARED VOTING POWER - None 7 SOLE DISPOSITIVE POWER - 1,338,724 8 SHARED DISPOSITIVE POWER - None 9 AGGREGATE AMOUNT OWNED - 1,338,724 10 IF AGGREGATE AMOUNT EXCLUDES CERTAIN SHARES - Not applicable 11 PERCENT OF CLASS REPRESENTED - 10.1% 12 TYPE OF REPORTING PERSON - see pages below1a NAME OF ISSUER - Aastrom Biosciences, Inc. 1b ADDRESS OF ISSUER - 24 Frank Lloyd Wright Drive P.O. Box 376 Ann Arbor, MI 48106 2a NAME OF FILER - State Treasurer, State of Michigan 2b ADDRESS OF FILER - Michigan Department of Treasury Alternative Investments Division P.O. Box 15128 Lansing, MI 48909 2c CITIZENSHIP - State of Michigan 2d CLASS OF SECURITIES - Common Stock 2e CUSIP NUMBER - 00253U107 3 PERSON FILING - Not applicable 4 OWNERSHIP - Reference Item 5 through 11 on previous page 5 OWNERSHIP UNDER 5% - Not applicable 6 OWNERSHIP OVER 5% - Not applicable 7 INDENTIFICATION OF SUBSIDIARY - Not applicable 8 IDENTIFICATION OF MEMBERS - Not applicable 9 NOTICE OF DISSOLUTION - Not applicable 10 CERTIFICATION - Not applicable Pursuant to State Law (Section 91 of Act No. 380 of the Public Acts of 1965, as amended), the State Treasurer, State of Michigan is the investment fiduciary for the following four State sponsored retirement systems: Public School Employees' Retirement System; State Employees' Retirement System; Michigan State Police Retirement System; and Judges' Retirement System. The Michigan Department of Treasury's Bureau of Investments performs the investment function, under the direction and on behalf of the State Treasurer. The aforementioned State Law created an Investment Advisory Committee comprised of the Director of the Department of Commerce, the Director of the Department of Management & Budget, or their duly authorized representatives, and three public members appointed by the Governor with the advice and consent of the Senate. The committee meets quarterly and reviews investments, goals, and objectives, and may submit recommendations to the State Treasurer. The Investment Advisory Committee may also, by a majority vote, direct the State Treasurer to dispose of any holdings which in the committee's judgement is not suitable for the funds involved, and may by unanimous vote direct the State Treasurer to make specific investments. Act No. 314 of the Public Acts of 1965, as amended, authorizes the investment of assets of public employee retirement systems or plans created and established by the state or any political subdivision. The acquisition of equity securities are made for investment purposes only. Investments in equity securities are made from the assets of the aforementioned four retirement systems with total assets of approximately $40.0 billion. The retirement systems derive revenue from employer and employee contributions, court fees, and investment income. Name: Mr. Douglas B. Roberts Business Address: Michigan Department of Treasury P.O. Box 15128 Lansing, Michigan 48901 Principal Occupation: State Treasurer, State of Michigan Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Mr. Samuel Valenti, III Business Address: Masco Corporation 21001 Van Born Road Taylor, Michigan 48180 Principal Occupation: Vice President of Investments Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Dr. Paul W. McCracken Business Address: University of Michigan School of Business Administration 701 Tappan Ann Arbor, MI 48109-1234 Principal Occupation: Consultant Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Mr. Farris W. Womack Business Address: University of Michigan Fleming Admin. Bldg., Room 3014 503 Thompson Street Ann Arbor, MI 48109-1340 Principal Occupation: Executive Vice President and Chief Financial Officer Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Ms. Kathleen M. Wilbur Business Address: Department of Commerce Director's Office 4th Floor, Law Building Box 30004 Lansing, Michigan 48909 Principal Occupation: Director, Michigan Department of Commerce Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Roy A. Pentilla Business Address: Michigan Department of Treasury P.O. Box 15128 Lansing, Michigan 48901 Principal Occupation: Deputy Director, Bureau of Investments Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Alan H. Van Noord Business Address: Michigan Department of Treasury P.O. Box 15128 Lansing, Michigan 48901 Principal Occupation: Administrator, Stock Analysis Division Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Paul R. Nelson, II Business Address: Michigan Department of Treasury P.O. Box 15128 Lansing, Michigan 48901 Principal Occupation: Administrator, Fixed Income Analysis Division Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Linda J. Rose Business Address: Michigan Department of Treasury P.O. Box 15128 Lansing, Michigan 48901 Principal Occupation: Acting Administrator, Alternative Investments Division Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Milan J. Maat Business Address: Michigan Department of Treasury P.O. Box 15128 Lansing, Michigan 48901 Principal Occupation: Administrator, Short Term Investment Division Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Vernon L. Johnson Business Address: Michigan Department of Treasury P.O. Box 15128 Lansing, Michigan 48901 Principal Occupation: Administrator, Trust Accounting Division Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Philip L. Van Syckle Business Address: Michigan Department of Treasury P.O. Box 15128 Lansing, Michigan 48901 Principal Occupation: Administrator, Mortgage and Real Estate Division Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America Name: Richard J. Holcomb Business Address: Michigan Department of Treasury P.O. Box 15128 Lansing, Michigan 48901 Principal Occupation: Administrator, Quantitative Analysis Division Criminal convictions during the last five years: None Civil finding or violation, or injunction against violation, of federal or state securities laws during the last five years: None Citizenship: United States of America After resonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement, is true, complete and correct. Date: 01-30-98 Signed: Roy A. Pentilla, Acting Director, Bureau of Investments