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Diffusion is the net movement (spreading out) of molecules or atoms down a concentration gradient: from a region of high concentration to a region of low concentration.
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Concentration of Proteins
You will consider green's equation $$c(x, t) = (N / √4πDt) e^{−x2/4Dt}$$
And $N$ is small at $x=0$ and divide the equation by $N$
and using drift velocity $v=xt$ find the $x$
plug in all given values …