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 (Masson 1929), or by immunofluorescent staining of matrix proteins such as collagens, fibronectin and laminins (Kozlova et al. 2020). The gene discussed is LAMB2; the disease is neoplasm.