Bd bioscience :            http://www.bdbiosciences.com/index.shtml

eBioscience :               http://www.ebioscience.com/

Invitrogen :                 http://www.invitrogen.com/site/us/en/home.html

Purdue :                       http://www.cyto.purdue.edu/

Current Protocols:        http://www3.interscience.wiley.com/browse/?type=CURRENT_PROTOCOL

Santa Cruz Biotechnology, Inc.:    http://www.scbt.com/flow_cytometry.html