Re: Canine B-cell marker Three canine B-cell specific antibodies (inc a CaCD21) were described at the canine leukocyte Ag workshop (CLAW) last year (see Immunol. Today 15, 347-352). I have no hands-on experience of these though, and it may be that you've tried these already. Rob Brines Immunology Today IT at elsevier.co.uk