The evidence that eukaryotic gene expression must be a highly regulated process is available to anyone just by observing their own body. The various parts of our body differ dramatically in appearance, ranging from the muscular tissues to the eye with a lens. Moreover, even our palms outside vs. inside have different textures and skin coloration. This is further evident from the appearance of secondary sexual organs such as breast tissue in females and facial hair in males after puberty. However, all these diverse types of tissues arose from a single cell, the fertilized egg or zygote, raising the question of how this diversity is achieved.<\/p>\n\n\n\n