BMT in chronic phase. Clinical course is reported in terms of the mean clinical score. There is no statistically significant difference between treated and untreated mice. Bold arrow indicates time of treatment. Arrow 1 indicates killing of 3 animals from each group for proliferation and ELISA assays and use of 3 animals from each group for DTH. Arrow 2 indicates killing of 1 animal from each group for histology and 3 from each group for RT-PCR of the spinal cord.