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.
exists and is an alternate of . Sclerenchyma cells are the dead cells and they are devoid of protoplasm.The walls of Sclerenchyma are greatly thickened with deposition of lignin. Such cells are called lignified.Due to excessive thickening of the walls of sclerenchyma cell, its cell cavity or lumen is nearly absent.