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Former employees of Mallinckrodt and Monsanto of St Louis , MO partnered to form Midland Scientific .
 Mallinckrodt, Monsanto, St Louis , MO
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mallinckrodt, Monsanto, St Louis , MO