The origin of non-coding sequences, especially introns, is an outstanding issue that has been receiving continuous debate for the last two decades.
非编码序列，特别是内含子的起源，是一个重要的悬而未决的问题。
The origin of non-coding sequences, especially introns, is an outstanding issue that has been receiving continuous debate for the last two decades.
非编码序列，特别是内含子的起源，是一个重要的悬而未决的问题。
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