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EMSA using Enh-A locus A (a) or locus B (b) probes and 10 µg of PBLs nuclear extracts from five young healthy donors aged from 24 to 31 years and five elderly healthy donors aged from 59 to 68 years. FP indicates free probe and (*) indicates unbound DNA probe without nuclear extract. A1–A6 and B1–B4 correspond to the bandshifts in the order of mobility for the locus A and locus B, respectively.
