#PhotoOfTheDay: This image of a rat liver endothelial cell shows actin filaments (brownish orange) and microtubules (white). Both of these protein structures work together to give the cell its shape. Intracellular gaps are visible in the image; these holes can disrupt the liver’s protective blood barrier and might indicate injury, inflammation, or cancer. Image: Francisco Lázaro-Diéguez/Albert Einstein College of Medicine https://www.quantamagazine.org/see-inside-cells-like-never-before-in-these-vivid-microscopic-images-20261021/