19406
The aim of the present study was to determine the effects of extremely low - frequency magnetic field ( ELF - MF ) on accumulation of manganese ( Mn ) in the kidney , liver and brain of rats .
 manganese, Mn
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 manganese, Mn