1. 
   countertransport
   The transport of one substance across a membrane, coupled with the simultaneous transport of another substance across the same membrane in the opposite direction. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?countertransport
   
   
2. 
   countertransport
   (koun″tәr-trans´port) the simultaneous transport of two substances across a membrane in opposite directions, either by the same carrier or by different carriers that are biochemically linked to each other. See also cotransport.
   Found op http://www.encyclo.co.uk/local/21001
   
   
3. 
   countertransport
   Type: Term Pronunciation: kown′ter-tranz′pōrt Definitions: 1. The transport of one substance across a membrane, coupled with the simultaneous transport of another substance across the same membrane in the opposite direction.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=20979
   
   

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