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Here , we investigate the self - assembly of these superstructures by comparing the quiescent and vortex - assisted aggregation of insulin and its individual A and B chains in the presence or absence of reducing agent tris ( 2 - carboxyethyl ) phosphine ( TCEP ) .
 Chemical: tris ( 2 - carboxyethyl ) phosphine; Chemical: TCEP
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: tris ( 2 - carboxyethyl ) phosphine; Chemical: TCEP