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Genes & Cells

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Prenatal Test

PUT TO THE TEST  Prenatal blood tests that analyze fetal DNA are more reliable than standard screening methods for detecting whether babies carry certain extra chromosomes that can cause birth defects.

Babies

EQUAL SHOT  Every year, slightly more boys than girls are born. But when egg meets sperm, roughly equal numbers of male and female embryos are conceived, a new study finds.

REGULAR RATE  A genetic analysis suggests that the Ebola virus, shown here in orange, is not evolving as fast as expected.

Genes & Cells

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