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Lan, H.A. and Zain, R.B. and Saitoh, M. and Muramatsu, Y. and Shrestha, P. and Mori, M. (1996) Proliferating cell nuclear antigen (PCNA) and p53 in epithelial dysplasia and squamous cell carcinoma of oral mucosa - a marker for poor tumor differentiation, increasing nuclear atypia and invasiveness. Anticancer Research, 16 (5 B). pp. 3059-3065. ISSN 0250-7005,