Give us the FACS

Thanks for your article on FACS.1 It was informative. How is the charge imparted to a specific droplet? By magic?Peter Calkins, PhDDepartment of Pathology pcalkins@bcm.tmc.eduResponse: The nozzle is actually charged, so as the droplet is formed a charge is applied to the droplet. Based on the sorting instructions, the droplet is charged either positively or negatively. The plates are always on during the sort.David MatsuyamaBecton Dickinson David_Matsuyama@bd.com