In article <david_gonda-3010941701520001 at dkgonda.med.yale.edu>, david_gonda at qm.yale.edu (David Gonda) writes: I have tested monoclonals from Boehringer-Mannheim, Promega and Sigma in immunofluorescence flow cytometry on fixed cells and found Promega to give the highest signal to noise. Todd Sladek Chicago Medical School todds41 at aol.com