Before revision:  We further propose experimental measurements of quantities like the variance and the lag-1 autocorrelation function in protein fluctuations as  early signatures of an approaching bifurcation point in the cell differentiation process.
After revision:  We further propose experimental measurements of quantities like the variance and the lag-1 autocorrelation function in protein fluctuations as the early signatures of an approaching bifurcation point in the cell differentiation process.