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Quantification of HLA-A (a) and HLA-B (b) mRNAs from PBLs of 54 healthy subjects aged from 21 to 90 years using competitive RT-PCR procedure. Linear regression analysis shows that the correlation coefficients between age and transcription rate are R2 0·38 with P < 0·0001 (a) and R2 0·16 with P = 0·0025 (b).
