When cancers become resistant to the drugs used to treat them, it has become possible – at least in principle – to understand the cause of that resistance through sequencing, and if a drug exists that is effective against cells with the mutation, to change a patient's treatment accordingly. But a better strategy might be to prevent resistance from developing at all.more »

LONDON – The two molecules, one on the egg and one on the sperm, that interact with each other at the moment of fertilization are now known.

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