Transport of intracellular organelles along the microtubule cytoskeleton occurs in a bidirectional manner due to opposing activity of microtubule-associated motor proteins of the kinesin and dynein families. Regulation of this opposing activity and the resultant motion is believed to generate a polarized distribution of many organelles within the cell. The bidirectional motion can be ... https://www.markbroyard.com/great-pick-ego-sebitar-solution-500ml-supply-limited-choice/