title: Comparison of the Panicogenic Effects of Cck-4 and Co2 in Normal Controls: Koszycki D, Bradwejn J, Bourin M, McGill University, 3830 Lacombe, Montreal, Canada H3T 1M5., and Univer. de Nantes, 1, Gaston Veil, 44035 Nantes Cedex, France.