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已发现部分Ⅰ型和Ⅱ型内含子能在基因间移动．这种移动现象可分为内含子回归和内含子转座．移动是通DNA位点专一重组或内含子的反向剪接实现的．
It has been found that some type I and type II introns can move between genes. This phenomenon of movement can be divided into intron regression and intron transposition. Movement is mediated by DNA-site-specific recombination or intron reverse splicing.