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IDO immunostaining of fallopian tubes at different stages of murine pregnancy. IDO-positive cells were immunolocalized in fallopian tubes of syngeneic pregnant (Balb/c× Balb/c) mice at early (a), mid (b) and late (c) gestational periods. Fig. d: negative control slide. Black arrows show IDO positive cells (Magnifica-tion: 200 ×).
