Better half

Why half the chromosomes can be twice as useful

A group of U.S. and Israeli researchers has developed a method to turn unfertilized human eggs into dividing embryonic stem cells (ESCs) containing only half the normal number of chromosomes. The haploid cells could both simplify and speed up screens against genetic mutants that are routinely performed in diploid cells.

"It's easier to study the function of a gene variant when there isn't another version of the gene in

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