LAWRENCE, Mass.--(BUSINESS WIRE)--Nexcelom Bioscience LLC, provider of innovative devices and instruments for cell-based assays in cancer research and drug discovery, today announced it continues to expand its line of Cellometer automated cell counters with the launch of the Cellometer Auto X4. The Auto X4 is a fluorescence-assisted cell counter that is ideal for two main applications: one, primary samples such as PBMCs, splenocytes and other digested tissues; and two, fluorescence-based viability assays.