Aquaporin 7 is a beta-cell protein and regulator of intraislet glycerol content and glycerol kinase activity, beta-cell mass, and insulin production and secretion - Matsumura, K; Chang, BH J; Fujimiya, M; Chen, W; Kulkarni, R N; Eguchi, Y; Kimura, H; Kojima, H; Chan, L (Mol Cell Biol, 2007)