Functions of Acps and mammalian seminal proteins that fall into common conserved classes. References: He et al. (1999); Malm et al. (2000); Mueller et al. (2004, 2008); O'Rand et al. (2006); Poiani (2006); Da Ros et al. (2007, 2008); Ravi Ram and Wolfner (2007a); Wong et al. (2008a). This figure appears in color in the online version of Journal of Heredity.