Flow cytometry cell sorting is routinely used in basic research and clinical research. The constant development of more sophisticated instruments fitted with an increasing number of lasers (4 lasers is becoming the norm) allows more and more complex applications. Yellow/Green lasers have been developed more recently and allow the detection of red fluorescent proteins that were only barely detected with the previous lasers. A Yellow/Green laser, in combination with a minimum of 2 or 3 other lasers, has become a necessity to be able to carry on some of the work included in current research programs. In addition to this we also require full sorting capabilities of 12 - 16 parameters with the ability to perform 4-way sorting and single cell sorting into 96 well plates.