 The facility also has major pieces of equipment needed for hES cell analysis such as a Zeiss 510 Meta Two-Photon Confocal Microscope. The facility will shortly have a BD LSR II Flow cytometer and a BD FacsAria cell sorter. Pretested reagents will be available to investigators through the core facility. These will include medium components, growth factors, feeder cells, gelatin, Matrigel, antibodies and primers to assay stem cell marker expression. In addition, the core facility will assist in karyotype analysis and tumor formation tests of hES cells. 