#taxis.reaction__taxi  a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism
  supertype:  reaction.bodily_process__response  a bodily process occurring due to the effect of some foregoing stimulus or agent; "a bad reaction to the medicine"; "his responses have slowed with age"
  subtype:  chemotaxis  movement by a cell or organism in reaction to a chemical stimulus
     subtype:  negative_chemotaxis  movement away from a chemical stimulus
     subtype:  positive_chemotaxis  movement toward a chemical stimulus

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