LAMB2 and neoplasm: While epithelial cells can be distinguished by positive staining of various cytokeratins (Karantza, 2011), the visualization of stromal compartment within a tumor can be done via Masson’s Trichrome stain that stains for collagen and fibrin for brightfield imaging (Foot, 1933), or by immunofluorescent staining of matrix proteins such as collagens, fibronectin and laminins (Kozlova et al., 2020).