Also called freight ton . a unit of volume for freight that weighs one ton, varying with the type of freight measured, as 40 cubic feet of oak timber or 20 bushels of wheat. 3. metric ton. 4. displacement ton. 5. a unit of volume used in transportation by sea, commonly equal to 40 cubic feet (1.13 cu. m).
When in a biological process, less specialized cells evolves into more specialized ones, the process is called as cell differentiation. This process is mostly seen in multicellular organisms.
However, embryonic stem cells have some restriction for the ethic problems, so tissue-specific stem cells, such as mesenchymal stem cell became the main engineering cell. Many studies have showed that stem cells can differentiate into cardiomyocytes in vivo or in vitro and then improve poorly functional heart. But little information about the mechanism on how stem cells differentiate is known.