The fertilized ovum divides and produces 'stem cells'. Each of these stem cells can produce various types of other body cells hence they are pluripotent cells. Together the stem cells produce the 400+ types of cells whick compose our bodies. This amazing process is call 'differentiation'.

The fertilized ovum divides and produces ‘stem cells’. Each of these stem cells can produce various types of other body cells hence they are pluripotent cells. Together the stem cells produce the 400+ types of cells whick compose our bodies. This amazing process is call ‘differentiation’.