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Partial nucleotide sequence (reverse) representing the mutant (A) and normal (B) {Shown by asterik and arrows}, of KRAS exon 1 gene. 3A: Transition of C > T at codon 19; CTT > TTT; Leu > Phe in Exon 1 of KRAS oncogene. 3B: Transversion of A > T at codon 16; AAG > TAG; Lys > Stop in Exon 1 of KRAS oncogene
