“…White blood cells were isolated from peripheral blood using lysing buffer (BD Biosciences; Franklin Lakes, NJ, USA), followed by an incubation with fluorescein isothiocyanate (FITC)‐conjugated mouse anti‐canine CD3 (clone CA17.2A12, Bio‐Rad Laboratories; Hercules, CA, USA), allophycocyanin (APC)‐conjugated rat anti‐canine CD8 (clone YCATE55.9, Bio‐Rad Laboratories) and phycoerythrin (PE)‐conjugated mouse anti‐human CCR4 (clone 1G1, BD Biosciences) monoclonal antibodies in washing buffer at 4°C for 30 min. Antibodies with appropriate isotypes (FITC‐conjugated mouse IgG1, clone MOPC‐21, Bio Legend; APC‐conjugated rat IgG1, clone 43414, R&D Systems; Minneapolis, MN, USA; PE‐conjugated mouse IgG1, clone MOPC‐21, Bio Legend) were used for each sample.…”