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Ori is the DNA sequence that signals for the origin of replication, sometimes referred to simply as ''origin''. In ''E. coli'', ''ori'' is some 250 nucleotides in length for the chromosomal origin (''oriC''). The plasmid ''ori'' sequences are similar to ''oriC''. During conjugation, the rolling circle mode of replication starts at the ''oriT'' ('T' for transfer) sequence of the FAT plasmid. Bacteria have a single origin for replication. Eukaryotes have multiple replicons, each with an ''ori''. The replicons range from 40 kb length, in yeast and ''Drosophila'', to 300 kb in plants. Mitochondrial DNA in many organisms has two ''ori'' sequences. In humans, they are called ''oriH'' and ''oriL'' for the heavy and light strand of the DNA, each is the origin of replication for single-stranded replication. ==See also== * Origin of replication 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ori (genetics)」の詳細全文を読む スポンサード リンク
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