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Glass, ceramic, and carbonized radioac-sume that these three types of microspheres tive microspheres have been employed in have a similar vascular distribution. There the estimation of arteriovenous shunt flow is some doubt as to whether this assumption and the measurement of the distribution of *Supported by USPHS Grant NO. ~~0 2 1 5 0 -1 0 blood flow within an organ(1-3). In such and by a grant from the Hartford Foundation determinations, the investigator must as-(0697-5875-02).

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