Forms the centrioles of the centrosome in animal cells, used to move chromosomes to opposite sides of the cell during nuclear division. Helps form cilia and flagella in eukaryotic cells (primarily animal cells) for mobility Provides tracks for organelles to move inside the cell, such as transport vesicles moving between the ER and Golgi apparatus Is found near the internal surface of the cell membrane and allows for cell movement, such as microvilli and amoeboid movements of macrophages (white blood cells) During cell division of animal cells, helps form the cleavage furrow as daughter cells begin to separate into two cells. Maintains the positioning of the nucleus and other organelles, and maintains cell shape by withstanding tension or stretching of the cell, such as skin cells In plant cells, provides cytoplasmic streaming to circulate nutrients and molecules throughout the cytoplasm