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Bacteriophage 29 is a double-stranded DNA virus that infects Bacillus subtilis Bacteria. This virus is highly studied because of its mechanism of loading DNA and later injecting it into its bacterial host. This is a tailed phage and when the tail comes in contact with its host it injects the DNA like a syringe. This transmission electron micrograph (TEM) was taken of the virus frozen in a very thin layer of buffer.