cells are probably red blood cells that have been lysed during the fixation process. There are 2 cells darkly stained with hematoxylin in the lumen, which are probably some leukocytes. According to the few number of cells present in the lumen of the structure, its considerable size relative to the surrounding cells, presence of single layer of simple squamous cells lining the lumen, and lack of tunica media (smooth muscle), the structure can either be a capillary, a lymphatic vessel, or a venule. However…
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