MRSA BUSTER A compound secreted by the nose-dwelling bacterium Staphylococcus lugdunensis may fight antibiotic-resistant strains of bacteria such as MRSA (pink).
NIAID, NIH/Wikimedia Commons
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.
Scientists have identified a protein that chops up the mitochondrial DNA in a dad’s sperm after it fertilizes an egg. The finding helps explain why mitochondrial DNA is usually passed on only by mothers.