ScienceDaily -- It turns out that the milk of human kindness is evoked by something besides mom's good example. Research by psychologists at the University at Buffalo and the University of California, Irvine, has found that at least part of the reason some people are kind and generous is that their genes nudge them toward it.
MORE: http://www.sciencedaily.com/releases/2012/04/120410093151.htm
See also...
Social Stress Changes Immune System Gene Expression in Primates
http://www.sciencedaily.com/releases/2012/04/120409164513.htm
