Beacham I R, Garrett S
J Gen Microbiol. 1981 May;124(1):225-8. doi: 10.1099/00221287-124-1-225.
Restriction-proficient strains of Salmonella typhimurium are shown to be ineffective as recipients of normal RP4::Mucts62 due to the operation of two restriction systems (hsdSA and hsdLT) on the Mu moiety of this plasmid. Strains mutant in both these hsd loci are excellent recipients.