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 form of loose connective tissue that develops within an embryo. It consists of a ground substance, made up of proteins and water and being gelatinous in texture, that protects and supports the cells and reticular fibers within.d. The mesenchymal cells arise largely from the mesoderm as the embryo continues to differentiate. Mesenchyme is considered a form of reticular connective tissue because it contains reticular fibers, which are fibers made up of a certain type of collagen known as type III collagen.