FIGURE 4 .
4Ratio of the inactivatable to the noninactivatable components of release (= peak/ steady level -1) versus the internal [Mg 2+] (mean values +-SEM; n indicated above each corresponding **data** point). All release records were corrected for depletion of calcium from the SR before determining peak/steady level. Same fibers and pulses as in Figs. 2 and 3.
