NRAS exon 2 sequence coverage maps. Sequence coverage for exon 2 of NRAS is shown for the Discovery set of 94 AML samples (both tumor and skin), the 94 CALGB AML samples, and the 22 SCN-AML samples; each row represents an individual sample. Each column represents a single nucleotide position starting from the 5′-intronic region (■), through exon 2 of NRAS (□) and 3′-intronic region (■). The position of codons 12 and 13 of NRAS is highlighted. High-quality double-stranded sequence is shown in green, single-stranded coverage in yellow, and no coverage in red.