20364
Biochemistry career While at Merck & Co. , where he was hired as a researcher in 1950 , he led a team that developed a method to synthesize the enzyme ribonuclease .
 Merck & Co.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Merck & Co.