16070
Embryos were injected with 0 . 08 micro g PCBs / g egg weight and 0 . 50 micro g PCBs / g egg weight ( 0 . 01 and 0 . 064 ng toxic equivalent / g , respectively ) at embryonic day 0 , prior to incubation .
 Chemical: PCBs; Chemical: PCBs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PCBs; Chemical: PCBs