Evidence for tryptophan residues in the cation transport path of the Na(+),K(+)-ATPase.
Yudowski GA, Bar Shimon M, Tal DM, Gonz?lez-Lebrero RM, Rossi RC, Garrahan PJ, Beaug? LA, Karlish SJ. Evidence for tryptophan residues in the cation transport path of the Na(+),K(+)-ATPase. Biochemistry. 2003 Sep 02; 42(34):10212-22.