Mullin NP, Gagliardi A, Khoa LTP, Colby D, Hall-Ponsele E, Rowe AJ, Chambers I. Distinct Contributions of Tryptophan Residues within the Dimerization Domain to Nanog Function. Journal of Molecular Biology. 2017 May;429(10):1544–53. doi: 10.1016/j.jmb.2016.12.001.