IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-12-3-47065 Original Research Paper Comparative Evaluation of Natural Killer Cell (CD57) Expression in Oral Leucoplakia and Oral Squamous Cell Carcinoma: An Immunohistochemical Study Geeta Karyakarte Dr. Dr Akshay Karyakarte Dr. March 2023 12 3 01 02