Enumeration of CD45⁺ cells infiltrating the spleens of transplanted mice. CD45 postive cells were isolated 4 weeks posttransplant from spleens of untreated mice, mice treated for 4 weeks with E21R alone and/or MoAb cA2 starting from the time of transplant (early treatment), or starting 4 weeks posttransplant (late treatment). Values are the means + SEM from five mice; # P < .05 compared with untreated mice.