Fragments arising from the loss of G and SA from these clusters remain undetected. The major fragmentation pathways for a glycine bisulfate cluster (G) 3 (A) 0 (SA) 2 are the loss of neutral G, the loss of SA, and the loss of (G)(SA). As shown in Figure and S8, these three fragmentation pathways begin at higher collisional energies than those required for A and (A)(SA) loss (from the mixed clusters), indicating that more energy is required to remove G or (G)(SA) from the cluster. It is notable that (G) 3 (A) 0 (SA) 2 readily loses (G)(SA) rather