An induced pluripotent stem cell-derived sensory neuron labeled to show tubulin and actin. Tubulin is a globular protein that serves as the primary building block of microtubules—hollow, cylindrical fibers that form a crucial part of the eukaryotic cytoskeleton. Actin is a vital, highly conserved globular protein that forms the microfilaments of the eukaryotic cytoskeleton and the thin filaments in muscle cells.
Image courtesy of Stella Whittaker, NIH-NINDS.