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Expression of TLR9, but not of TLR3 or TLR7, is significantly increased in hTERT PHKs exposed to various doses of UV radiation. hTERT PHKs were exposed to the doses of UV radiation indicated in the figure. After 4, 8, and 12 h, total RNA was propagated, and the expression levels of TLR9 (A), TLR3 (B), and TLR7 (C) were determined by RT-qPCR and normalized to GAPDH levels. **, P < 0.01; ns, not significant.
