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Messenger RNA (mRNA) levels of toll-like receptors (TLR)2 and 4 in the fetal thymus.The TLR2 (A) mRNA increased 12 hours after lipopolysaccharide (LPS) exposure compared to controls. The TLR4 (B) mRNA was increased 2 hours, 8 days, and 15 days after LPS exposure in the fetal thymus. *P < .05 versus controls.
