Figure 5.

Normalization of squid I_K activation by GHK (filled circles). The curve describing these results ($n_{\infty }^4(V)$ revised) corresponds to (α_n/(α_n + β_n))⁴ where α_n = 0.01(V + 50)/(exp(−0.1(V + 50)) − 1) and β_n = 0.125 exp(−(V + 60)/20). The curve labeled HH $n_{\infty }^4$ is given by the same equation with β_n = 0.125 exp(−(V + 60)/80).