Bacteria are engaged in a constant battle against preying viruses. called bacteriophages (or phages). These remarkable nano-machines pack and store their genomes in a capsid and inject it into the cytoplasm of their bacterial prey following specific adhesion to the host cell surface. Tailed phages possessing dsDNA genomes are the most abundant phages in the bacterial virosphere. https://www.jandroutboard.com/product-category/puzzle/