Site-specific recombination between phages lambda and phi 81 and integration of hybrid phages lambda-phi 81]

Dependence of the formation frequency of hybrid phages immlambdahphi81 and immphi81hlambda in recombination between phages lambda and phi81 from int-function of both phages is studied. Phages with hybrid att-sites (Plambda OP'phi81 and Pphi81OP'lambda) are isolated and the efficiency of integration of these phages into bacterial chromosome is determined.