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General features of the Skeletonema cpDNAs. (A) Sizes and (B) AT contents of PCG, rRNA, tRNA, ncRNA, tmRNA, and intergenic spacer region (ISR) for the six Skeletonema cpDNAs. (C) Relationships between G + C contents and GC skews, (D) Relationships between A + T contents and AT skews of Skeletonema cpDNAs and other 55 published Bacillariophyta cpDNAs.
