Acetylcholine at an inexcitable junction Research material relating to the paper 'Action, and spontaneous release, of acetylcholine at an 'inexcitable' nerve-muscle junction'. Figures and correspondence comprising letter from Cambridge University Press returning prints dated February 1955, correspondence with R Keynes dated January 1955 and letter to J Castillo enclosing draft of paper dated July 1954. Also figures, some of which are mounted. With Jose del Castillo 1954-1955