Figure 2From: Endogenous avidin biotin activity (EABA) in thyroid pathology: immunohistochemical study Aberrant biotin in nuclei of morular cells of PTC cribrifirm-morular variant. CK-7 stain (LSAB+ visualization method) glandular cells show CK-7 expression (membranous reaction); aberrant biotin present in nuclei of morular cells. Objective magnification 40×.Back to article page