Figure 7.

MFBs in the ZnT3^−/− hippocampus show normal ultrastructure. Electron micrographs of MFBs in s lucidum of CA3, taken from a ZnT3^+/+ (A) and a ZnT3^−/− (B) mouse. ZnT3^−/− MFBs were normal with respect to their size, the approximate number of small, clear synaptic vesicles contained within them, the numbers and types of synaptic contacts made with dendritic spines, and the presence of mitochondria. Note the asymmetric synaptic contacts (arrowheads) on dendritic spines (S) and a pyramidal cell dendrite (D).