you could try to use TOPRO3 or a similar dye excitable with a little HeNe
laser, that should perfectly work, and no problems with interacting
fluorescein fluorescence should arise.
Wolfgang
Dr. Wolfgang Beisker
GSF - Durchflusszytometrie phone: (+49)(0)89 3187 2842
Ingolstaedter Landstr. 1 FAX : (+49)(0)89 3187 3349
86764 Neuherberg EMAIL: Beisker@gsf.de