In mammals and birds, the reproductive biology and functional morphology are researched. In the reproductive biology, the localization and transition of the sex steroid hormones and these receptors are investigated in the testis and placenta of domestic animals and wild animals, and the functions of the sex steroid hormones in the testis and placenta is clarified. In the functional morphology, the range of movement of the limbs is analyzed in a nondestructive method centering on wild animals, and I elucidate the morphological adaptation to environment.

1. Promotion of fostering Chemical Hazard Control Expert
2. Graduate international collaborations for this program

1. Sasaki, M., Yamamoto, M., Arishima, K., Eguchi, 1998. Y. Effects of follicle-stimulating hormone on intermediate filaments and cell division of Sertoli cells of fetal rat testisin culture. J.Vet.Med.Sci.60: 35-39.　
2. Sasaki, M., Yamamoto, M., Arishima, K., Eguchi, Y. 2000. Effect of follicle-stimulating hormone on Sertoli cell division in cultures of fetal rat testes. Biology of the Neonate.78: 48-52.
3. Sasaki, M., Endo, H., Wiig, Ø., Derocher, A. E., Tsubota, T., Taru, H., Yamamoto, M., Arishima, K.,　Hayashi, Y.  Kitamura, N., Yamada, J. 2005. Adaptation of the hindlimbs for climbing in bears. Ann. Anat. 187: 153-160.
4. Sasaki , M., Endo, H., Kimura, J., Rerkamnuaychoke, W., Hayakawa, D., Bhuminand, D., Kitamura, N., Fukuta, K. 2010.Immunohistochemical localization of the cytoskeletal proteins in the testes of the lesser mouse deer (Tragulus javanicus). Mammal Study 35: 57-64.
5. Hayakawa, D., Sasaki, M., Suzuki, M., Tsubota, T., Igota, H., Kaji, K., Kitamura, N. 2010.Immunohistochemical localization of steroidogenic enzymes in the testis of the sika deer (Cervus nippon) during developmental and seasonal changes. J.Reprod.Dev. 56: 117-123.