Effects of soluble IL-10 receptor on the proliferation of BCBL-1 and BC-1 cells. Cells (5 × 10³ cells/microwell) from the BCBL-1 and BC-1 cell lines were cultured for 3 days with or without the addition of 25% autologous conditioned medium with medium alone or in medium supplemented with soluble IL-10 receptor (100 ng/mL). ³H thymidine was added during the final 20 hours of culture. The results represent the mean (±SD) radioactivity of triplicate cultures. Shown is a representative experiment of 5 performed.