7323
The same ligands also exhibit a similar inhibitory effect on PDGF - BB - dependent [ 3H ] thymidine incorporation in PAE cells expressing the PDGF beta - receptors .
 PDGF - BB, PDGF beta - receptors
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 PDGF - BB, PDGF beta - receptors