If you need to remove pathogens from your mouse or rat lines, rederivation can be performed by TGEF, so the investigator can import animals into MSU, transfer these animals to a clean facility or send them to other institutes. The investigator will need to provide plugged females as embryo donors that have been superovulated and mated.  TGEF can assist you with required protocols for superovulation and mating. We will also provide hormones to investigators for superovulation for the rederivation line, at no extra cost.