Electrospray ionization mass spectrometry (ESI-MS) of a cytochrome c yielded two successive (adjacent) peaks with m/z values of 1365.76 (p1) and 1516.40 (p2). Calculate the mass of this cytochrome c based on these data. Remember that the measured m/z values of two adjacent peaks (p1 and p2) arise from ions with charges z1 and z1-1 (p1 and p2 differ by a single proton with p2 having one fewer positive charge due to its higher m/z value): (1) p1 = (M + z1)/z1 and (2) p2 = (M + z1 – 1)/(z1 – 1)