The fossilized trail of an aquatic creature suggests that animals walked using legs at least 30 million years earlier than had been thought.
- In some genetic cases of microcephaly, stem cells fail to launch
- Yale team discovers how Zika virus causes fetal brain damage
- Scientists uncover the way a common cell enzyme alerts the body to invading bacteria
- Arctic gives clues on worst mass extinction of life
- Calcium channel blockers caught in the act at atomic level
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