Figure 2From: Identification of exon 19 and 21 mutations of EGFR gene in Chinese patients with esophageal squamous cell carcinomaMutations in the K-RAS gene in esophageal squamous cell carcinoma samples. (A) No mutation in codons 12 and 13. (B, C) Heterozygous GGT → GTT mutation in the second position of codon 12 in two samples (arrow).Back to article page