Osteoclast breaking down dentine, TEM

False-coloured transmission electron micrograph of a bone cell responsible for breaking down bone tissue (osteoclast; top half of image) forming a pit in dentine (dense calcified tissue that makes up the core of a tooth below the outer enamel; bottom half of image). A specialised cell membrane (ruffled border) forms between the surface of the osteoclast and the dentine. The nucleus of the osteoclast is also visible (pink). Horizontal image width is 41 microns.