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Rate constant of the decrease in 14C in intracellular macromolecules during a 4-h dark period in LP (solid bars) and SP cells (open bars). To calculate the rate constant, 14C decrease in each fraction was fit to exponential curves using the following equation: R (t) = R 0 e −kt. In this equation, R 0 and R (t) are 14C-radioactivities in each fraction (dpm (103 cells)−1) at time zero and t, respectively. k rate constant. Data in Fig. 5c, d were used for calculations
