Fig. 1.
Time courses of radioactivity in serum after i.v. coinjection of 131I-P-GUS (A) and 125I-albumin (B) (550,000 cpm of each) in 2-day-old (•), 5-day-old (▴), 1-week-old (▪), 2-week-old (▾), and 7-week-old (♦) mice. n = 3-8 mice per point.
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