Immunohistochemical Study of Endocrine Cells in the Stomach and Small Intestine of the Lion (Panthera leo) Pyarokhil, Asadullah Hamid and Sasaki, Motoki and Tomikawa, Sohei and Maetani, Ayami and Yuhara, Kazutoshi and Kobayashi, Yoshiyasu and Kitamura, Nobuo, Mammal Study, 42, 179-184 (2017), DOI:http://dx.doi.org/10.3106/041.042.0308