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INVITRO INTERNATIONAL SIGNS INVESTOR RELATIONS FIRM

Makenna Delaney & Sullivan, Inc. to assist the firm. W. Richard Ulmer (800) 2-INVITRO INVITRO

INVITRO INTERNATIONAL REPORTS SECOND QUARTER RESULTS AND COMMENTS ON ANNUAL MEETING

Company Looks Forward with Cautious Optimism Irvine, CA, May 5, 1998 — InVitro International’s (Bulletin

PRESIDENT’S LETTER

To Our Shareholders: InVitro International finished the 1997 fiscal year by recording its lowest quarterly

INVITRO REPORTS YEAR ENDED FINANCIAL RESULTS

CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS Year Ended September 30, 1997 1996 Revenues $720,000 $1,063,000 Costs

INVITRO INTERNATIONAL REPORTS THIRD QUARTER RESULTS

Company Announces Lowest Quarterly Loss and Expands Merger Options Irvine, CA, August 15, 1997 —

INVITRO INTERNATIONAL REPORTS SECOND QUARTER RESULTS

Company Signs Merger Letter Of Intent With Miragen Irvine, CA, May 15, 1997 — InVitro

INVITRO INTERNATIONAL SIGNS MERGER LETTER OF INTENT

IRVINE, CA, March 3, 1997 — InVitro International (Nasdaq SmallCap Market Symbol “INVI”) today announced

INVITRO INTERNATIONAL REPORTS FIRST QUARTER RESULTS

Board Of Directors Defer Decision To Implement 1-For-10 Reverse Stock Split Recently Approved By Shareholders

INVITRO INTERNATIONAL TO REACH NEARLY 4 MILLION NEW MOTHERS IN 1997 WITH GUARDIAN DNA

$1.8 Million In INVI Sales To Result From Every 1 Percent Who Decide To Buy