Microtubules are tiny, hollow, bead-like tubular structures that help cells maintain their shape. Along with microfilaments and intermediate filaments, they form the cytoskeleton of the cell, as well as participate in a variety of motor functions for the cell.
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Macrophage is a type of white blood cell which is a phagocyte.
Neutrophils are the most abundant white blood cell in humans and arise from granulocytes.