85147
These investigators also patented the protein , selling all rights to its use to Immunex , a biotechnology company that was acquired by Amgen in 2002 .
 Immunex, Amgen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Immunex, Amgen