@article{mbs:/content/journal/jgv/10.1099/0022-1317-40-3-705, author = "Okker, R. J. H. and de Groot, B.", title = "Specificity of Partial Exclusion of Bacteriophage T2 in Crosses with T4", journal= "Journal of General Virology", year = "1978", volume = "40", number = "3", pages = "705-709", doi = "https://doi.org/10.1099/0022-1317-40-3-705", url = "https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-40-3-705", publisher = "Microbiology Society", issn = "1465-2099", type = "Journal Article", abstract = "Summary An attempt was made to isolate a bacteriophage T4 mutant generally disturbed in its ability to exclude the localized exclusion sensitivity determinants of T2 from the progeny of crosses. The method used was a modification of that used previously, which revealed T4 mutants unable to exclude more than one of the T2 sensitive sites specifically. One out of 1000 isolates from a mutagenized T4 am56:am32 stock was found to be mutated in its exclusion properties. However, the mutant was not generally exclusion deficient. Its properties were similar to those of a double mutant T4 ex56:ex32, specifically unable to exclude the T2 sensitive sites near gene 56 and gene 32. The failure to isolate a generally excluding mutant at a frequency down to 10−3 renders the occurrence of a general exclusion locus unlikely.", }