Summary
Although phages P1 and ϕAmp are heteroimmune (Chesney and Scott, 1975 and Yarmolinsky, unpublished), their plasmid prophages are incompatible. Thus, the immunity and compatibility systems are two distinct regulators of phage replication. The two prophages, and plasmid P15B (Ikeda, Inuzuka and Tomizawa, 1970) constitute a new compatibility group, designated Y.
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Hedges, R.W., Jacob, A.E., Barth, P.T. et al. Compatibility properties of P1 and ϕAMP prophages. Molec. gen. Genet. 141, 263–267 (1975). https://doi.org/10.1007/BF00341804
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DOI: https://doi.org/10.1007/BF00341804