Joseph Daniel Fiedler for NPR

Fetal Cells May Protect Mom From Disease Long After The Baby's Born

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Psyched that it's finally spring? Shifts in the season may affect more than your mood. Corbis hide caption

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Seasons May Tweak Genes That Trigger Some Chronic Diseases

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In some human diseases, the wrong mix of bacteria seems to be the trouble. Getty Images hide caption

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Mix Of Gut Microbes May Play Role In Crohn's Disease

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Streptococcus pyogenes shouldn't be taken lightly. Left untreated, an infection with germ can trigger an autoimmune disease that damages the heart. NIAID/Flickr.com hide caption

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