Distribution of MVBs docked on mitochondria and isolated in the cytoplasm. A. Distribution of MVBs docked on mitochondria in dendrites, axons, and nonsynaptic cell processes. B. Percentage of docked and isolated MVBs in the six cortical layers. ^*The number of MVBs docked on mitochondria in layer II was lower than in any other layer (χ2, P < 0.05). C, D, E. Proportions of MVBs docked on mitochondria and isolated in the cytoplasm within the three subcellular compartments.