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The percent (A) of 131I-P-GUS taken up by the brain and multiple-time regression analyses (B) of 131I-P-GUS and 125I-albumin after i.v. injection in 2-day-old and 7-week-old mice. 131I-P-GUS and 125I-albumin (550,000 cpm of each) were coinjected. n = 5-7 mice per point.
