9916
The presence of cutaneous xanthomas with normal serum lipid levels is due to the antibetalipoproteic activity of the monoclonal immunoglobulin .
 monoclonal immunoglobulin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 monoclonal immunoglobulin