Viable cells recovered from hind paws of rats with adoptively transferred adjuvant-induced arthritis and joint scores. Rats received 2 × 108 thoracic duct cells obtained from syngeneic donors 9 days after inoculation with complete Freund's adjuvant. At the times indicated, arthritis was scored in all paws and cells then were prepared from the synovium-rich tissues of the hind paws by intra-arterial perfusion with collagenase (Materials and methods). Black indicates total viable cells per pair of hind paws (mean ± standard deviation [SD], n = 5). Gray indicates joint score (mean ± SD, n = 5).