Letter from Howard Walter Florey to G F Gauze, Institute of Research on New Antibiotics, Academy of Medical Sciences, Moscow E P Abraham told him of work done at Institute on antimetabolite produced by a mutant of Staphylococcus aureus - understands work was discussed when Gauze visited Oxford and that it was felt that collaborative investigation of the structure of the antimetabolite would be useful - Abraham would welcome visit from Professor M G Brajnikova to discuss possible collaboration - supports idea and should be pleased if Gauze could arrange visit - suggests Professor Brajnikova come in 1963 and stay for 3-4 weeks. 9 May 1962