Inoue Y, Nakahara K, Kangawa K, Murakami N. Transitional change in rat fetal cell proliferation in response to ghrelin and des-acyl ghrelin during the last stage of pregnancy. Biochemical and Biophysical Research Communications. 2010 Mar;393(3):455–60. doi: 10.1016/j.bbrc.2010.02.022.