22684
These findings suggest that PCB 180 , Aroclor 1221 and endosulfan may be estrogenic in immature uterotrophic assay .
 PCB 180, Aroclor 1221, endosulfan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 PCB 180, Aroclor 1221, endosulfan