Figure 1: Reversal of the third cleavage directions by micromanipulation and the resultant 8-, 12- and 16-cell stage embryos. Figure 2: Chirality-reversed eight-cell stage embryos developed to snails ...

Previous studies have demonstrated that aneuploidy in human embryos is surprisingly frequent with 50–80% of cleavage-stage human embryos carrying an abnormal chromosome number. Here we combine ...

A method that can generate human embryonic stem cells without harming embryos? In August biotechnology firm Advanced Cell Technology (ACT) in Worcester, Mass., claimed it had developed just such a ...

Two new techniques might make it possible to derive stem cells from embryos without destroying them – possibly offering an “ethical” way of harvesting stem cells. The advances, both published online ...