Microtubules are the largest type of filament, with a diameter of about 25 nanometers (nm), and they are composed of a protein called tubulin. Actin filaments are the smallest type, with a ...

Cisterna and Vitriol also took home 20th with their image showing early-stage mouse neuroblastoma cell differentiation (actin, microtubules and mitochondria). That image was the cover photo of the ...