Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal Can anyone recommend a fluorescent dye (and suitable protocol) to label membranes (plasma membrane)in tissue (Drosophila eye). The tissue is expressing GFP so something which emits red would be ideal. I see Molecular Probes, sorry Invitrogen, sell their lipohpilic tracers (e.g. Dil) as crystals, oils and pastes but I'm not sure which would be best for this application. Any advice gratefully received. Thanks Simon