575
Four of 15 patients with R2 had rheumatoid arthritis and in two of these four cases the antibody was of the IgA class .
 GENE: R2; GENE: IgA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: R2; GENE: IgA