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Polymorphism analysis of MTHFR 677. The PCR products were digested with restriction enzyme Hinf I in groups: 1,12,13; CT genotype (183 bp, 153 bp, 35 bp), 2,3,4,5,7,9,10,11,14 CC genotype (183 bp) 6; TT genotype (153 bp, 35 bp), 8; negative control, 15; (ladder 50 bp)
