Feng-Yen Li, Benjamin Chaigne-Delalande, Chrysi Kanellopoulou, et al.  Nature 475, 471-476 (28 July 2011). New & Views Immunology: Magnesium in a signalling role from Ning Wu & André Veillette

http://www.nature.com/nature/journal/v475/n7357/full/nature10246.html