original_query: What conclusion did the Russian medical doctor make after studying the effects of scurvy on mice fed an artificial mixture of milk constituents?
query: What conclusion did Nikolai Lunin make after studying the effects of an artificial mixture of milk constituents on mice?
answer: Nikolai Lunin concluded that milk must contain small quantities of unknown substances essential to life, in addition to the known principal ingredients (proteins, fats, carbohydrates, and salts).