This Week in Science

In a Science paper published online in advance this week, an international research team shows that blocking the expression of Xist, a non-coding RNA that inactivates one of the X chromosomes in females, improves somatic cell nuclear transfer in a mouse model. The team "also identified an Xist-independent mechanism that specifically down-regulated a subset of X-linked genes through somatic-type repressive histone blocks," it writes.

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