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Variation in nucleotide composition of the D-arms of cyanobacterial tRNAs. The D-arm of canonical tRNA possesses three to four nucleotides. However, a few cyanobacterial tRNAs were found to possess only two nucleotides in the D-arm. The D-arms of Synechococcus elongatus PCC 7942 (gene id: 640711018) and Cyanothece sp. BH63E ATCC 51,472 (gene id: 2507502103) contained only two nucleotides.
