3507
OKT3 - induced human PBMC proliferation was determined by measuring ( 3 ) H - thymidine incorporation .
 Chemical: ( 3 ) H - thymidine
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: ( 3 ) H - thymidine 
Answer:
 Chemical: ( 3 ) H - thymidine