Ammonia Concentration in Porcine Ovarian Developing Follicles Tareq, K. M. A. and Obata, Ryuichiro and Miah, A. G. and Hammano, Ko-ichi and Tsujii, Hirotada, Journal of Mammalian Ova Research, 22, 185-189 (2005), DOI:http://dx.doi.org/10.1274/jmor.22.185