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. Author manuscript; available in PMC: 2007 Apr 12.
Published in final edited form as: Nature. 2006 Oct 1;443(7112):700–704. doi: 10.1038/nature05193

Figure 4.

Figure 4

Effects of neurotransmitters on cerebellar molecular layer capillary, and of ischaemia on retinal capillary. a Localized noradrenaline-evoked constriction near pericytes (black arrows, clearest in panel 4), and dilation by superimposed glutamate. Noradrenaline-evoked constriction cannot reflect fluid movement caused by arterioles constricting, because this would make the capillary dilate. b Diameter at pericyte; numbers show image times above. c Mean (±s.e.m.) constriction by noradrenaline, at pericyte and non-pericyte sites. d Dilation (reduction of noradrenaline-evoked constriction) by glutamate (as percentage of pre-noradrenaline diameter). e Retinal capillary before ischaemia and in ischaemia before anoxic depolarization. f Diameter at pericyte in e.