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Researchers collect microbial biofilms in the Frasassi cave system in central Italy.

Photo of researchers collecting microbial biofilms in the Frasassi cave system, central Italy.

Penn State University doctoral student Dan Jones (standing) and postdoctoral researcher Sharmishtha Dattagupta collect microbial biofilms in the Frasassi cave system in central Italy, on May 28, 2008.

Credit: Ieva Perkons

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