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carrier protein
Channel proteins facilitate the diffusion of different molecules, while carrier proteins are involved in the movement of ions, small molecules, or macromolecules, such as another protein, across a biological membrane.〔Sadava, David, et al. Life, the Science of Biology, 9th Edition. Macmillan Publishers, 2009. ISBN 1-4292-1962-9. p. 119.〕 Carrier proteins are integral/intrinsic membrane proteins; that is they exist within and span the membrane across which they transport substances. The proteins may assist in the movement of substances by facilitated diffusion or active transport. These mechanisms of movement are known as carrier-mediated transport.〔Thompson, Liz A. Passing the North Carolina End of Course Test for Biology. American Book Company, Inc. 2007. ISBN 1-59807-139-4. p. 97.〕 Each carrier protein is designed to recognize only one substance or one group of very similar substances. Research has correlated defects in specific carrier proteins with specific diseases.〔Sadava, David, Et al. Life, the Science of Biology, 9th Edition. Macmillan Publishers, 2009. ISBN 1-4292-1962-9. p. 119.〕
==Active transportation==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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