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From a second series of experiments, the typing results between biopsies of 10–20 cells performed at the blastocyst stage and the rest of the embryo were compared. Whole Genome Amplification (WGA) was applied on cell extracts from the biopsy before typing. From 60 samples, 95% were genotyped and a similar rate of allelic drop out was observed when compared to analyses made from full embryos (2-3%). Another set of 40 samples was used to evaluate the minimum number of cells to be biopsied taimi dating site before pre amplification. WGA was performed on all samples and allowed genotyping in 98% of cases with <10% drop out rates from biopsies of 8–10 cells. Continue reading →