Genes & Cells

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cloned sheep

CLONE CLUB  Dolly the Sheep’s nearly identical sisters — Debbie, Denise, Dianna and Daisy — were produced from the same mammary gland tissue as Dolly. The new clones are not aging prematurely as was feared for Dolly.

silhouettes of primates

EASY RIDER  Gut bacteria have been passed down from the ancestors of humans and African apes for millennia, evolving alongside their hosts, says a new study that looked at bacteria from gorillas, bonobos, chimpanzees and humans. 

young boy biting his fingernails

Nail-biting and thumb-sucking bring germs into the mouth — and possibly fewer allergies, too.  

Genes & Cells

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