1. Radiological Health SciencesColorado State UniversityFt. CollinsColorado80523USA
2. Celtrix PharmaceuticalsSanta ClaraCalifornia95050USA
3. R & D Systems, Inc.MinneapolisMinnesota55413‐2690USA
4. Life Sciences DivisionLawrence Berkeley National LaboratoryUniversity of CaliforniaBerkeleyCalifornia94720USA