File:Chenhsun2.jpg

A)Cell with intrinsic noise have different color. B)Extrinsic noise will cause different cells have different expression profiles but doesn't affect gene expressions in the same cell (TOP). Intrinsic noise are the randomness in micro event such as translation due to the small number of DNA copies and will affect gene expression in the same cell. C)Gene expression profiles with different contribution from extrinsic or intrinsic noise.