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Microtubules - histology illustration

Molecular "tags" on microtubules direct traffic inside cells. Motor proteins haul molecular cargo within cells by traveling along protein fibers called microtubules. Enzymes modify microtubules by adding or removing different molecules from their surfaces. These "tags" act like cellular traffic signals, guiding motor proteins as they travel throughout cells.

Credit: Nicolle Rager Fuller, National Science Foundation



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