Especially absurd is Mr. Wilson’s contention that the very existence of multicellular organisms, including human beings, supports his contention; he claims that each of us is a group whose cells might therefore be congratulated for their coordination and cohesion, as a manifestation of group-selected altruism. The simple reality, however, is that our cells are genetically identical. When a liver cell labors at the unpleasant task of detoxifying blood while leaving all the fun of reproducing to the gonads, that cell isn’t being altruistic at all but rather wholly selfish, since the success of the gonads is biologically indistinguishable from success of the liver cell - www.wsj.com