Purified TPC isoforms form NAADP receptors with distinct roles for Ca(2+) signaling and endolysosomal trafficking. by Ruas, M, Rietdorf, K, Arredouani, A, Davis, L, Lloyd-Evans, E, Koegel, H, Funnell, T, Morgan, A, Ward, J, Watanabe, K, Cheng, X, Churchill, G, Zhu, M, Platt, F, Wessel, G, Parrington, J, Galione, A