Exhibit 4.28 REGISTRATION AND SALE PARTICIPATION RIGHTS AGREEMENT THIS AGREEMENT is made as of the 7th day of April, 2005. BETWEEN: HEMOSOL CORP., a corporation governed by the laws of Ontario (the "Corporation") - and - MDS INC., a corporation...Registration and Sale Participation Rights Agreement • June 30th, 2005 • Hemosol Corp • Biological products, (no disgnostic substances) • Ontario
