Table 1. A partial list of the reported values of the average intracellular protein concentration. When the refractive index was measured, it was converted to dry mass concentration as C = (n_cell - n_medium)/0.19, using the number for n_medium provided by the authors. Cell density d_cell was converted to C as C = 2.5(d_cell - 1). When water mass fraction F_w was determined by drying, we used the formula C = (1 - F_W)/(1 + 0.4F_W) [6]. MC in mouse fibroblasts and cultured cortical neurons were determined by the method of Mudrak et al. [18]