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Ref : 003267-07 - © Jean-Claude RÉVY - ISM Biochemist holds up and examines a test-tube containing plasmid DNA marked with a dye (ethidium bromide) that fluoresces under ultra- violet light. Plasmid DNA is seen as the yellow band at the base of the test-tube. This DNA sample was centrifuged, concentrated, and purified in cesium chloride. |