16327
Regressions developed for Hg biomagnification in the food chain were log10 CTHg ( nanograms per gram ) = 0 . 27 x delta ( 15 ) N ( /1000 ) - 0 . 42 , R ( 2 ) = 0 . 87 , for THg and log10 CMMHg = 0 . 33 x delta ( 15 ) N ( /1000 ) - 1 . 0 , R ( 2 ) = 0 . 93 , for MMHg .
 Hg, ( 15 ) N, ( 15 ) N, MMHg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Hg, ( 15 ) N, ( 15 ) N, MMHg