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Table 4 Aligned fragment lengths of mtDNA sequences (total 4594 bp). Codon positions are combined across all protein-coding genes (ND1, ND2, cytochrome b), and RNA includes 12S and nine tRNA genes (L, I, Q, M, W, A, N, C, Y).

From: Strong mitochondrial DNA support for a Cretaceous origin of modern avian lineages

Gene Aligned length (bp) Variable sites (%) Parsimony informative sites
First codon positions 1043 699 (67%) 605
Second codon positions 1043 512 (49%) 380
Third codon positions 1043 1043 (100%) 1041
RNA 1465 910 (62%) 728