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Kin (A) and Vi (B) values of 131I-P-GUS and 125I-albumin for brain after i.v. coinjection at various ages. n = 3-8 mice per bar. Asterisks indicate a significant difference in comparison with 2-day-old mice: *, P < 0.05; **, P < 0.01; ***, P < 0.001. ND, not detected (no blood-to-brain entry).
