6679
As the length of the fatty acid decreased , the binding affinity was reduced ; myristic acid ( 14 : 0 ) bound with a K ( d ) of 1409 + / - 423 nM , but medium - chain ( decanoic acid , 10 : 0 ) and short - chain ( octanoic acid , 8 : 0 ) lipids were not bound at all .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None