UNHOLY ALLIANCE. “It is interesting to think that the genetic modules that are now involved in the regulation of what we call ‘altruistic’ regulated programmed cell death may have initially emerged and become selected as ‘selfish genetic modules’, for the sole reason that encoding an executioner and an inhibitor of the executioner just made them good at propagating themselves.”
http://www.nature.com/cdd/journal/v9/n4/full/4400950a.html