All

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 E01 Diagnosis D003933 +
  E01.450 Laboratory Techniques and Procedures D003942 +
   E01.450.865 Specimen Handling D013048 +
    E01.450.865.366 Preservation, Biological D011309 +
      E01.450.865.366.643 Refrigeration D012034 
      E01.450.865.366.833 Tissue Preservation D014021 +
      E01.450.865.366.156 Cryopreservation D015925 +
 E05 Investigative Techniques D008919 +
  E05.760 Preservation, Biological D011309 +
    E05.760.643 Refrigeration D012034 
    E05.760.833 Tissue Preservation D014021 +
    E05.760.156 Cryopreservation D015925 +