CellPro Trading Moves to NASD OTC Bulletin Board.

SEATTLE--(BUSINESS WIRE)--Oct. 23, 1998--CellPro, Incorporated will begin trading Monday, October 26, 1998 on the NASD OTC Bulletin Board service under the ticker symbol CPRO. The stock had previously traded on the NASDAQ System under the symbol CPRO.

Comments or forward-looking statements should be understood in the context of CellPro's publicly available reports filed with the SEC, including the most recent Annual Report on Form 10-K, which contain a discussion of various factors that may affect CellPro's business. These factors could cause actual future performance to differ materially from current expectations regarding future performance, results or achievements. Particular attention should be given to the Investment Considerations labeled "Future Capital Needs; Potential Inability to Access Capital Markets; Possible Insolvency," "Legal Proceedings," "Patents and Proprietary Technology" and "Dependence on CEPRATE(R) SC System," in CellPro's Annual Report on Form 10-K for the fiscal year ended March 31, 1998 and to the Company's press release dated September 28, 1998.

Located in Bothell, Washington, CellPro, Incorporated is a biotechnology company that develops, manufactures and markets proprietary continuous-flow, cell-selection systems for use in a variety of therapeutic, diagnostic and research applications. Its CEPRATE(R) SC System is being marketed in the United States, Canada, the EC, Israel, Latin America and the Asia-Pacific.