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DUBAI:Fighting, bombing and a blockade by militiamen of food and water that have killed hundreds of people in the southwestern Yemeni city of Taiz have not spared the animals of the local zoo.But thanks in part to the work of an animal-lover a world away in Sweden, the beasts now have a better chan new balance blanche ce of surviving.The feathered and furry denizens of the c nb 574 ity zoo are slowly dying from starvation and untreated wounds before the eyes of helpless keepers, in another sign of suffering the impoverished country has endured in nearly a year of war. A worker holds lion cubs outside their cage at a zoo in Yemen's southwest nb ern city of Taiz on February 23, 2016. PHOTO: REUTERS Scientists have long known that bacteria in the intestines, also known as the microbiome, perform a variety of useful functions for their hosts, such as breaking down dietary fiber in the digestive process and making vitamins K and B7.Yet a new study unveils another useful role the microbiome plays. A team of researchers from Brown University found that in mice, the gut microbiome regulates the host鈥檚 immune system 鈥?so that rather than the host鈥檚 defense system attacking these helpful bacteria, the bacteria can coexist peacefully with the immune system.What鈥檚 the trick to the microbiome鈥檚 work with the immune system? Vitamin A 鈥?the bacteria moderate active vitamin A levels in the intestine, protecti adidas yeezy ng the microbiome from an overactive immune response.That insight may prove important for under nike high dunk standing and treating autoimmune and nike store dunk inflammatory diseases, said Shipra Vaishnava, an assistant professor of molecular microbiology and immunology at Brown.鈥淎 lot of these diseases are attributed