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Space of Mall in human liver, hiding in plain sight. (A) White spaces between pink collagen bundles of the portal tract stroma. H&E stain; original magnification, ×400. (B) Immunohistochemical staining of hyaluronic acid (DAB; brown) shows that, between the now‐unstained collagen bundles, these spaces are filled. Vimentin (magenta) and CD34 (teal) highlight vascular structures. Original magnification, ×400.
