 Lymphopoiesis can be viewed in a "mathematical" sense as a recursive process of cell division and also as a process of differentiation, measured by changes to the properties of cells.Considering the P as the ‘mother’ cell, but not a true stem cell, it may divide into two new cells, which are themselves identical, but differ to some degree from the mother.Or the mother cell P may divide unequally into two new daughter cells both of which differ from each other and also from the mother.