BL2 Recombinant Laboratory checklist UM IBC Facilities Review Form for Recombinant DNA Work Laboratories planning recombinant DNA work at Biosafety Level 2 (BL2) or Biosafety Level 3 (BL3) must be inspected by UM OSEH prior to the initiation of the work and on a regular basis thereafter. This process begins with IBC registration of reco