5184
While uptake of Fe ( 3 + ) via the Tf mechanism is well understood , uptake of Mn ( 3 + ) via this mechanism has not been systematically studied .
 Chemical: Fe ( 3 + ); Chemical: Mn ( 3 + )
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Fe ( 3 + ), Mn ( 3 + ) 
Answer:
 Chemical: Fe ( 3 + ); Chemical: Mn ( 3 + )