Definition: Provisional name for a family of small, nonenveloped, isometric bacterial viruses with genomes of single-stranded positive sense RNA (MW 1 × 106). Virions adsorb to the sides of bacterial pili, and crystalline arrays are formed in infected bacteria. The type species is enterobacteria phage M52.
[L. levis, light (not heavy)]
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Examples: glitazone, GI cocktail, etc.