TY - RPRT TI - LambdaattB-attP, a lambda derivative containing both sites involved in integrative recombination. AU - H A Nash PY - 1974 DO - 10.1016/0042-6822(74)90121-4 UR - https://pubmed.ncbi.nlm.nih.gov/4206535/ ID - 4206535 ER -