This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessReview by 1,*, 2 and 2 1 Department of Restorative Dentistry and Endodontics, Faculty of Dentistry, Semmelweis University, Szentkirályi u. 47, H-1088 Budapest, Hungary 2 Department of Anatomy, Histology and Embryology, Faculty of Medicine, Semmelweis University, Tűzoltó u. 58, H-1094 Budapest, Hungary * Author to whom correspondence should be addressed. Int. J. Mol. Sci.
