Want more? Research It! Diffusion happens in things as small as a single cell. Do some research and find out how! Email ECHO at [email protected] to let us know what you find and have a chance ...

For example, assuming a critical cell density of 10 8 cells ml −1 (Refs 7, 99), and an equidistant spacing of cells, the mean distance between two cells at the critical cell density, x 1 or ...