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Pictorial representation of a viral quasispecies as the background of a complex virosphere embedded in a diverse cellular world. (Original image composed by Esteban Domingo, Brenda Martínez-González, Pilar Somovilla, Carlos García-Crespo, María Eugenia Soria, Ana Isabel de Ávila, Ignacio Gadea, and Celia Perales, with the collaboration of Dr. Soledad Delgado.)