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(A) The semi-quantitation of IDO and GAPDH mRNA was performed by reverse transcription polymerase chain reaction. (B) The data were normalized to the mRNA expression of GAPDH. (C) The expression pattern of IDO at 28 S and 18 S rRNA. The IDO mRNA level was estimated by a Northern-blot analysis. (D) The data were normalized to the 18 S rRNA
