- L-leucyl-L-leucine methyl ester treatment of canine marrow and peripheral blood cells. Inhibition of proliferative responses with maintenance of the capacity for autologous marrow engraftment. Raff, R.F., Severns, E., Storb, R., Martin, P., Graham, T., Sandmaier, B., Schuening, F., Sale, G., Appelbaum, F.R. Transplantation (1988)