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Double-stranded DNA tailed bacteriophages typically code for 50-200 genes, of which 15-35 are involved in virion structure and assembly, DNA packaging, lysis, and DNA metabolism. However, vast numbers of other phage genes are small, are not required for lytic growth, and are of unknown function. The 1,885 sequenced mycobacteriophages encompass over 200,000 genes in 7,300 distinct protein 'phamilies', 77% of which are of unknown function. Gene toxicity provides potential insights into function, and here we screened 193 unrelated genes en