5290
To simulate maternal transfer in the present study , PBDE congeners BDE - 47 and BDE - 99 were topically applied to the eggshell and were allowed to diffuse into the egg contents of the red - eared slider ( Trachemys scripta elegans ) and snapping turtle ( Chelydra serpentina ) .
 PBDE, BDE - 47, BDE - 99
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 PBDE, BDE - 47, BDE - 99