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. 2008 Jan 25;105(5):1478–1482. doi: 10.1073/pnas.0710366105

Fig. 1.

Fig. 1.

A cartoon depiction of one modification cycle of the iterative counting strategy used to determine the number of KCNE1 subunits in a KCNQ1 K+ channel complex by using a derivatized charybdotoxin (CTX). Each complete round of chemical treatment modifies one E1 subunit, allowing for the direct counting of KCNE subunits in the K+ channel complex.