Cell Signaling Technology Carlos Del Castillo, IT manager at Cell Signaling Technology, drove the effort to move the company to Macs. Now  #147;no one worries about the system anymore, #148; he says.  #147;They #146;re concentrating on their work, using the Mac as a tool rather than as a computer. #148; Also, check out Why Mac for Science and other new features on the Science site.\ Nov 04