#culture_medium__culturemedium  (bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms
  supertype:  substance__matter  that which has mass and occupies space; "an atom is the smallest indivisible unit of matter"
  subtype:  nutrient_agar__agar  any culture medium that uses agar as the gelling agent
     subtype:  blood_agar__bloodagar  a culture medium containing whole blood as the nutrient

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