Stomach is a major source of circulating ghrelin, and feeding state determines plasma ghrelin-like immunoreactivity levels in humans - Ariyasu, H; Takaya, K; Tagami, T; Ogawa, Y; Hosoda, K; Akamizu, T; Suda, M; Koh, T; Natsui, K; Toyooka, S; Shirakami, G; Usui, T; Shimatsu, A; Doi, K; Hosoda, H; Kojima, M; Kangawa, K; Nakao, K (J Clin Endocrinol Metab, 2001)