18255
The pore size of a gel and the reproducibility in gel pore size are determined by three factors , the total amount of acrylamide present ( % T ) ( T = Total concentration of acrylamide and bisacrylamide monomer ) , the amount of cross-linker ( % C ) ( C = bisacrylamide concentration ) , and the time of polymerization of acrylamide ( cf. QPNC-PAGE ) .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None