Active transport of Tl+ by frog skin was compared with transport of K+ and Rb+. Tl+ was transported actively (using a Na,K-ATPase) by the epithelium and the adrenalin-stimulated glands.

In the epithelium, K+, Tl+ and Rb+ competed for transport in the ratio 1:1 ·7: 0· 9; in the glands the ratio was 1:1:1.

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