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. 2016 Nov 4;74(7):1261–1280. doi: 10.1007/s00018-016-2402-z

Fig. 4.

Fig. 4

Shows the relation between the phosphorylation state of SPAK in vitro and the concentration of Cl, [Cl]. The latter is sensed through the chloride sensor motif on the WNKs that directly inhibits WNK kinase activity. Over the physiological range (highlighted in pink) WNK4 shows the greatest sensitivity to [Cl]. KD here means kinase domain

From reference [66] with permission