Protein-lined tunnels that span the small intercellular space separating adjacent cells and that allow the rapid and direct passage of ions and small molecules,including signaling molecules,are called ________.

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The Answer of Protein-lined tunnels that span the small intercellular space separating adjacent cells and that allow the rapid and direct passage of ions and small molecules,including signaling molecules,are called ________.

Protein-Lined Tunnels That Span the Small Intercellular Space Separating Adjacent