What evidence is there for the existence of individual genes with antagonistic pleiotropic effects? - Leroi, AM; Bartke, A; De, Benedictis G; Franceschi, C; Gartner, A; Gonos, E; Feder, ME; Kivisild, T; Lee, S; Kartal-Özer, N; Schumacher, M; Sikora, E; et al. (MECHANISMS OF AGEING AND DEVELOPMENT, 2005)