6551
DAF is a 70 kD glycoprotein containing complement regulatory short consensus repeats ( SCRs ) ; its gene is located in the regulation of complement activation ( RCA ) gene cluster on chromosome 1 and is about 40 kb in size .
 DAF, regulation of complement activation, RCA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 DAF, regulation of complement activation, RCA