system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Griffith demonstrated transformation with -
assistant
The correct answer is  Griffith in 1928 found that mice died when injected with a mixture of live non-capsulated (R) pneumococci and heat killed capsulated (S) pneumococci, neither of which separately proved fatal. REF:Ananthanarayan and Panicker's Textbook ofMicrobiology 8thEdition pg no:63