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. 2001 Feb;21(4):1429–1439. doi: 10.1128/MCB.21.4.1429-1439.2001

FIG. 1.

FIG. 1

Rationale of the assay. Retrotransposition-defective L1s (RD-L1s) containing the mneoI indicator cassette were cotransfected into HeLa cells with retrotransposition-competent L1s (RC-L1s) lacking the cassette, and retrotransposition was determined as described in Materials and Methods. Explanations for the possible experimental outcomes are noted.