Antigenic markers on cells leaving calf thymus by way of the efferent lymph and venous blood.

A significant proportion of lymphoid cells which leave the calf thymus by the efferent lymph or blood have thymus-specific antigen (BTA) in their cell membrane. These were found to be larger than the majority of BTA-positive cells within the thymus. Similar cells were not observed in arterial blood, thoracic duct lymph or prescapular lymph nodes.