Methicillin-resistant Staphylococcus aureus (MRSA) emerged long before the introduction of the antibiotic methicillin into clinical practice, according to a new study. It was the widespread use of earlier antibiotics such as penicillin rather than of methicillin itself which caused MRSA to emerge, researchers suggest.

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Scientists have devised a strategy to target cancer cells while sparing normal cells by capitalizing on vulnerabilities that are exposed only in tumor cells. These vulnerabilities are known as the 'Achilles heel' of cancer cells. Although much is known about the mutations that cause a cell to become malignant, little is known about these vulnerabilities.