16415
Blood THg concentrations ( 0 . 03 - 7 . 04 mg / kg wet wt ; mean : 2 . 24 +/- 0 . 42 ) were strongly correlated with tail concentrations and were the highest yet reported in a snake species .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None