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Immunohistochemical staining of VEGF in retinal tissues in all groups of tree shrews. The experimental procedures were the same as stated in Figures 1 and 2. The retinal tissues of tree shrews in all the groups were harvested to examine the expression levels of VEGF in the retina by immunohistochemical staining. (a–e) ×200 magnification; (f–j) ×400 magnification.
