Butel, Janet S. (Baylor University College of Medicine, Houston, Tex.), Joseph L. Melnick, and Fred Rapp. Detection of biologically active adenovirions unable to plaque in human cells. J. Bacteriol. 92:433-438. 1966.-Plaque formation in green monkey kidney (GMK) cells by a defective simian virus 40-adenovirus 7 "hybrid" population (PARA-adenovirus 7) was enhanced by the addition of excess adeno...