TAILOR-MADE A semisynthetic strain of Escherichia coli makes glowing green proteins using amino acids not found in nature.
William B. Kiosses
GOING VIRAL Genetic studies of viruses from horseshoe bats (shown) in one cave in China suggest the animals are reservoirs of SARS coronaviruses. Bats harbor many viruses that can sometimes infect people, including Ebola and Marburg.
Libiao Zhang/Guangdong Institute of Applied Biological Resource, China
SHAPE SHIFTER Candida tropicalis usually grows as a harmless roundish budding yeast (green), but in the presence of two bacteria it stretches into long filaments (brown) that may provoke inflammation in intestines.