The philosophy of molecular biology was, for a time, entirely preoccupied with reduction and reductionism: primarily the reduction of classical genetics to molecular genetics (Kitcher 1984, Waters 1994, Sarkar 1998), but also and more recently the reduction of complex organismal phenotypes to genes (Rosenberg 1997, Sarkar 1998). While these remain of substantial interest, some new areas of interest have also emerged, including philosophical attention to molecular mechanisms (Machamer, Craver, and Darden 2000, Darden and Tabery 2005) and mathematical models (Keller 2002, Sarkar 2005). In-depth focus on the intricate details of the science is increasingly commonplace (e.g., Schaffner 2000, Burian 2004, Sarkar 2005). Molecular biology has also proved to be of philosophical interest not only for its own sake, but also in the service of molecular explanations of evolution (e.g., Burian 2004), disease (e.g., Kitcher 1996), and behavior (e.g., Schaffner 2000), inter alia.