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Extra letters added to life's genetic code
Scientists have created bacteria that thrive using an expanded 'genetic alphabet'.
Breastfed babies still need extra vitamin D
Many breastfed infants may not get enough vitamin D, because their mothers prefer not to give babies supplement drops, a study suggested.
Extra chromosome has a surprising effect on cancer
Having an extra chromosome may suppress cancer, as long as things don’t get stressful, a new study suggested.

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