20114
Serum leptin , soluble leptin receptor , interleukin ( IL ) - 1 , IL - 6 , IL - 7 , and tumor necrosis factor ( TNF ) levels were measured by enzyme - linked immunosorbent assays ( ELISA ) and were verified by in vitro lymphocyte proliferation assays and ELISAs .
 None
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:  
Answer:
 None