Graft rejection. Granulocyte and platelet changes in dog E156 conditioned with 200 cGy TBI, given a marrow graft from a DLA-identical littermate on day 0 and postgrafting immunosuppression with methotrexate/cyclosporine (MTX/CSP) for no more than 35 days (top panel). The bottom panel shows the results of testing for (CA)_n dinucleotide repeats of donor and recipient cells before transplantation (lanes 1 and 2) and recipient cells after marrow transplantation (lanes 3 to 14).