8524
Simple models of bimolecular interaction did not fully account for the kinetic profiles obtained with the parental antibodies and the hybrids , and this complexity suggested the existence of a conformational heterogeneity in these molecules .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None