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Time courses of the brain/perfusate ratios of 131I-P-GUS (•) and 131I-NP-GUS (○) corrected for 125I-albumin with transcardiac brain perfusion in 7-week-old mice. Neither 131I-P-GUS nor 131I-NP-GUS had a measurable uptake by brain. n = 3-4 mice per point.
