s should not exceed 300 words and should contain a statement of purpose, the method used, results, and conclusions. The name of the author presenting the paper must be underlined. Original abstracts and four copies should be sent to: Andrew Keenan, MDDept.of NuclearMedicineClinical Center, N.I.H.9000 Rockville PikeBethesda,Maryland20205Tel: (301)496-5675 The programw...