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The rDNA cistron of Asclepias syriaca. Blue boxes represent genes. Thick black lines represent additional transcribed sequence. The gray and dashed lines represent non-transcribed and unassembled sequence respectively. Only partial sequences of the non-transcribed spacer (NTS) and external transcribed spacer (ETS) were able to be assembled due to repeats, so the length of the intergenic spacer (IGS) remains unknown.
