Al – Azzawi , Lehadh M. 2019. “Immunohistochemical Analysis of PCNA and P53 Proteins in Oral Lichen Planus,Oral Dysplasia and Normal Oral Mucosa”. Diyala Journal of Medicine 6 (1):41-47. https://www.djm.uodiyala.edu.iq/index.php/djm/article/view/362.