MUNICH, GERMANY - NOVEMBER 26: Roundworms in a catgut in the institute for parasitology of the Ludwig-Maximilians-University Munich on November 26, 2003 in Munich, Germany. (Photo by Agency-Animal-Picture/Getty Images)
MUNICH, GERMANY - NOVEMBER 26: Roundworms in a catgut in the institute for parasitology of the Ludwig-Maximilians-University Munich on November 26, 2003 in Munich, Germany. (Photo by Agency-Animal-Picture/Getty Images)