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Span the membrane 1. channel proteins which have a hydrophilic channel that certain molecules or ions can use as a tunnel through the membrane (aquaporins facilitate the passage of water through the membrane) 2. carrier proteins bind to molecules and

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1. Span the membrane 1. channel proteins which have a hydrophilic channel that certain molecules or ions can use as a tunnel through the membrane (aquaporins facilitate the passage of water through the membrane) 2. carrier proteins bind to molecules and





 
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