Minor shift in background substitutional patterns in the Drosophila saltans and willistoni lineages is insufficient to explain GC content of coding sequences

Table 3 Percent GC of coding and noncoding sequences from D. willistoni, D. saltans and D. melanogaster

	Adh ^a	Sod ^a	Per	Xdh ^a	Amyrel ^a	Ddc ^a	Gpdh ^a	Short Introns	Long Introns
D. saltans	52.6	45.9	54.9^b	43.5				27.1^c	30.6^c
D. willistoni	54.1	52.1	60.5^a	47.2	48.5	52.9	51.6	32.9^c	35.5^c
D. melanogaster	81.5	76.0	80.8^a	64.4	68.2	73.6	76.5	34.5^d	37.1^d

^aPercent GC at third position sites as reported by Rodriguez-Trelles et al. [22]
^bPercent GC at third position sites as reported by Rodriguez-Trelles et al. [23]
^cPercent GC from combined analysis of RpL32, Adh, Hsp83, Sod, Gpdh, Amyrel, Ddc, per and ry, as reported by Powell et al. [27]
^dPercent GC from 225 introns in D. melanogaster, as reported by Hadrill et al. [38]

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