The genome of a bacteriophage usually consists
of double-stranded DNA, although some phage
genomes consist of single-stranded DNA or of
RNA. The size of the genome of phages ranges
from 1.6 kb to over 150 kb, representing anywhere
from a few to over 200 genes. One of the
smallest phages is !X174. F. Sanger and coworkers
sequenced the genome completely and
found that several of the ten genes of !X174
overlap.
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