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We studied p53, p63, p73 protein expression in the orofacial region of five human embryos aged 7-18 weeks of intrauterine development using a three-step immunohistochemical method. Expression of proteins in various locations was evaluated semiquantitatively. A decrease in p53, p63 and p73 proteins occurred in the 13-week-old material with the exception of the tooth germ where a drop in p73 appeared in the ninth week.

EXPRESSION OF p53, p63 AND p73 IN THE OROFACIAL REGION OF HUMAN EMBRYOS