It is used as a national identification number, tax payer number, social insurance number,driver's license number, for employment, etc. It is also commonly used as a customer number in banks, retailers, insurance companies, airlines, etc. Until the end of August 2013, the RUN was also used as the passport number.
The sclerenchyma cells are usually elongated, with tapering ends. Such cells are commonly described as sclerenchyma fibres. In some cases, the cells are shorter and irregular in shape. Such cells are commonly described as sclereids or stone cells.
Mesenchyme is a type of connective tissue found mostly during development of the embryo. It is composed mainly of ground substance with few cells or fibers. It can also be referred to as a group of mucoproteins found in certain types of cysts (etc.), resembling mucus.