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Genetics

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human blastocysts

EMBRYO, INTERRUPTED  A 5-day-old human embryo is usually composed of about 200 cells in a hollow ball configuration called a blastocyst (left). Embryos edited to remove the OCT4 gene (right) fail to make normal blastocysts.

flask of beer and yeast

MICROBE BREWS  Scientists are looking for a few good yeasts to enhance beer brewing. Each flask (above) contains the same liquid ingredients and a different kind of yeast.

container of artificial sweetener

Many people avoid artificial sweeteners because of a bitter aftertaste. But a combination of two of them, saccharin and cyclamate, blocks the bitter effects.  

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