Passive transport by facilitated diffusion requires the presence of specific integralmembraneproteins to facilitate the movement of the molecule across the membrane.
协助扩散的被动运输则要求特定的内在膜蛋白去帮助分子完成跨膜运动。
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Aquaorins are integralmembraneproteins occurring in mammals, plants, and microorganisms, which serve as channels that permit the bidirectional passage of water through cellular membranes.