931
During the 1980 ' s , quantifications of immunoserological testings , especially C reactive protein , rheumatoid factor and antistreptolysin O , progressed rapidly .
 C reactive protein, rheumatoid factor, antistreptolysin O
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 C reactive protein, rheumatoid factor, antistreptolysin O