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OD₂₆₀ x conversion factor  = �g/ml of nucleic acid,

1 OD₂₆₀ Unit = 50�g/ml for double-stranded DNA,
1 OD₂₆₀ Unit = 40�g/ml for single-stranded RNA,
1 OD₂₆₀ Unit = 35�g/ml for single-stranded DNA,
1 OD₂₆₀ Unit = 20�g/ml for single-stranded oligonucleotides.