13487
Dietary methylmercury ( MeHg ) uptake by fish in relation to life stage , species , and level of exposure is poorly understood in lower trophic levels , particularly in estuarine species .
 Chemical: methylmercury; Chemical: MeHg
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: methylmercury; Chemical: MeHg