1959 45 871 Experiments with single cells (from the uncloned culture not previously exposed to concentrations of the analogue greater than 1 μg per ml)..indicated a ‘one-step’ increase in resistance.
1980 34 153 Uncloned and cloned populations.
2010 (Nexis) 7 Aug. 20 It may disappoint those who like a bit of scaremongering, but a cloned cow is probably considerably safer to eat than an uncloned one.