Cell online: May 1, 2013 Cyclic [G(2',5')pA(3',5')p] is the metazoan second messenger produced by DNA-activated cyclic GMP-AMP synthase Pu Gao, Manuel Ascano, Yang Wu, Winfried Barchet, Barbara L. Gaffney, Thomas Zillinger, Artem A. Serganov, Yizhou Liu, Roger A. Jones, Gunther Hartmann, Thomas T...