microtubule
(MY-kroh-TOO-byool)
A narrow, hollow tube-like structure found in the cytoplasm (the fluid inside a cell) of plant and animal cells. Microtubules help support the shape of a cell. They also help chromosomes move during cell division and help small structures called cell organelles to move inside the cell. Certain anticancer drugs keep microtubules from working the way they should. This may help keep cancer cells from dividing.