RETREG2 and infection: Some of the mutant B. burgdorferi clones lacked plasmids that are not required for infection or persistence as follows: recJ1 lacks lp28-2, mag2 lacks lp28-4, ruvA1 is missing cp9, mutL2 lacks cp9 and cp32-3, nucA1 lacks lp21 and cp32-3, ruvB5 lacks lp28-4 and cp9 and priA3, recA2 and recA3 are missing cp9.