In the peri-implantitis diseased tissue group,CK-19 staining showed strong expression across all junctional epitheliallayers (Figure b).Conversely, E-cadherin expression in the junctional epithelium wasgenerally weak or absent across most samples, with only one showingsubstantial staining (Figure b). Here, KRT19 is linked to Peri-Implantitis.