Gadd MS, Jacques DA, Nisevic I, Craig VJ, Kwan AH, Guss JM, Matthews JM. A Structural Basis for the Regulation of the LIM-Homeodomain Protein Islet 1 (Isl1) by Intra- and Intermolecular Interactions. Journal of Biological Chemistry. 2013 Jul;288(30):21924–35. doi: 10.1074/jbc.m113.478586.