2371
Furthermore the number of binding sites determined using [3H]dihydrotestosterone , [3H]RU-1881 , or [3H] testosterone were comparable.
 binding sites
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 binding sites