What is a small protein channel that allows the passage of ions and small molecules between cells?

Name: What is a small protein channel that allows the passage of ions and small molecules between cells?
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Question

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Gap junctions are made up of small protein channels called connexins that allow the passage of ions and small molecules between cells. Hemidesmosomes, adhesion belts, tight junctions, and desmosomes are all types of cell-cell junctions, but they do not allow the passage of ions and small molecules.

What Is a Small Protein Channel That Allows the Passage