Northern blot demonstrating time course of IL-10 mRNA induction in unstimulated adult mononuclear cells (upper panel) and term neonatal cells (lower panel) and in LPS-stimulated cells at 6, 10, 14, and 24 hours in culture. IL-10 transcripts (1.8 kb) are shown in the upper panel and 18 S ribosomal RNA bands are shown for normalization of total cellular RNA loaded.