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. 2003 Oct 20;100(22):13081–13086. doi: 10.1073/pnas.2133652100

Fig. 5.

Fig. 5.

Properties of odor-evoked vascular responses in a glomerulus. (A) Vascular responses in a given glomerulus are odor-specific. A glomerulus was labeled with Oregon green dextran (Upper Left), and capillaries were visualized after i.v. injection of fluorescein dextran (Lower Left). Isoamyl acetate (AA) induced similar increases in inst.RBC flow in two capillaries (arrows) from the same glomerulus (Top and Middle Right; average of six and five odor stimulations, respectively). Propionic acid (PA) induced a decrease in inst.RBC flow (Bottom Right; average of four odor stimulations). (B) Odor-evoked vascular responses are glomerulus-specific. Almond induced a large increase in inst.RBC flow in capillary 1 (arrow), located in an activated glomerulus, but not in capillary 2 (arrow), located in a neighboring glomerulus (average of four and three odor stimulations, respectively). Note that capillaries are interconnected and separated by ≈200 μm. (C) Vascular responses occur 1–2 sec after the neuronal response. The vascular response was considered to begin when two successive values exceeded twice the standard deviation of the noise. The field potential electrode and the capillary were located in the same glomerulus. A delay of 1.4 sec separated the electrical and the vascular responses (see the enlargement).