However, the correlation for the pooled data was positive and weakly significant ( Fig. 2 P), supporting the suggestion that significant variation existed among chimaeric morulae before formation of the ICM.
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Re-evaluation of the causes of variation among mouse aggregation chimaeras.
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The sentences
This shows that technical failure occurs during chimaera production and suggests that experimental variation that arises during chimaera production is likely to be significant among the chimaeric conceptuses.