1 The Key Laboratory of Experimental Teratology of the Ministry of Education, State Key Laboratory of Reproductive Medicine and Offspring Health, Department of Histology and Embryology, School of Basic Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, 250012, China.
2 The Key Laboratory of Experimental Teratology of the Ministry of Education, State Key Laboratory of Reproductive Medicine and Offspring Health, Department of Genetics, School of Basic Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, 250012, China.
3 The Key Laboratory of Experimental Teratology of the Ministry of Education, State Key Laboratory of Reproductive Medicine and Offspring Health, Department of Histology and Embryology, School of Basic Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, 250012, China. sgp@sdu.edu.cn.