认为内含子在早期生命形式中即存在并被真核生物保留而被原核生物丢失的理论。
Theory that introns were present in early life forms and were retained by eukaryotes, but lost by prokaryotes.
型内含子的序列差异很大，但是它们都具有保守的碱基配对区，即保守的二级结构。
Although having great variance in sequence, group I introns share a number of conserved base-paired regions, which take part in the formation of the catalytic structure.
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