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Quantitative analysis of synaptic vesicles in excitatory synapses in BDNF mutant mice. a, Number of docked vesicles per micrometer of active zone length in the three genotypes. Data from CD1/BDNF and those from BL/6/BDNF mutant mice were combined. b, Number of reserve pool vesicles per presynaptic terminal in the three genotypes. n = number of synapses; N = number of animals.
