Affiliation: | 1.Department of Histology and Embryology, Poznań University of Medical Sciences, Święcickiego 6 St., 61-781 Poznań, Poland; (K.S.); (M.Ś.); (M.N.);2.Department of Anatomy and Histology, Collegium Medicum, University of Zielona Gora, Zyty 28 St., 65-046 Zielona Gora, Poland;3.Division of Histology and Embryology, Department of Human Morphology and Embryology, Wroclaw Medical University, T. Chałubińskiego 6a St., 50-368 Wroclaw, Poland |