Extrachromosomal DNA of pea (Pisum sativum) root-tip cells replicates by strand displacement

In cultured pea roots there is extrachromosomal DNA associated with cells that differentiate from the G2phase of the cell cycle that is absent from those that differentiate from the G1phase. We examined this extrachromosomal DNA by electron microscopy and found that it consisted of three types: (i)...

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