Letter from Howard Walter Florey to R A Kekwick, Lister Institute, Chelsea Bridge Road, London Says they have some material which they think might be fibrin - has been suggested that plasmin is a specific enzyme for dissolving fibrin - asks if this is a fair assumption and if so, could Kekwick provide a small quantity of plasmin - if idea is feasible, will get him to contact Kekwick. 24 November 1952