Mixed leukocyte culture reactivity of lymphocytes from a trichimeric recipient (dog# G643) and one of its DLA-identical donors (G642) and an unrelated DLA-nonidentical (G653) in response to stimulation with irradiated autologous lymphocytes and lymphocytes from the DLA-identical littermates and an unrelated dog. Blood samples for the MLR were collected from donor and recipient 7 months after HCT. Values shown are counts per minute (CPM) ± standard deviation of triplicate samples. Concanavalin A (ConA) served as the positive control.