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A 2% agarose gel showing PCR products from multiplex and uniplex PCR for CYP3A4*4, CYP3A4*18B and CYP3A4*22. L1: Quick-Load 100bp DNA ladder (NEB® inc, Massachusetts, USA). L2: multiplex pcr with band sizes of 244 bp, 331 bp and 793 bp. L3, L4 and L5 contain positive controls for CYP3A4*4 with 244 bp, CYP3A4*18B with 331 bp and CYP3A4*22 with 793 bp respectively. L6 is a negative control
