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Screening human tissues for the SULT1B1L145V allele. SULT1B1 PCR products, amplified from human genomic DNA, were digested with the HpyCH4IV restriction enzyme. No apparent digestion (lane 2) suggests the patient does not carry the SULT1B1L145V allele, while complete digestion (lane 4) suggests the patient is homozygous for the SULT1B1L145V allele.
