Neurotoxins as tools in lesioning experiments / E. MacDonald and J. Sirvio -- Structure and function of bacterial exotoxins which regulate second messenger generation / M.D. Lobban and G. Milligan -- Neurotoxins acting on acetylcholine receptors / V.A. Chiappinelli -- Toxins affecting ion channels / A.L. Harvey, A.J. Anderson and E.G. Rowan -- Differential neurotoxicity of endogenous and exogenous excitatory neurotransmitter receptor agonists / J.J. Vornov, R.C. Tasker and J.T. Coyle -- MPTP and Parkinson's disease / I. Irwin and J.W. Langston -- Neurotoxins from plants and fungi / G.G. Habermehl -- Actions of clostridial toxins on storage and release of neurotransmitters / L.L. Simpson -- Neurotoxins from spider venoms / N. Kawai and T. Nakajima