2810
The cDNAs for the HBPs containing signal sequences were synthesized , cloned into different mammalian expression vectors , and recombinant polypeptides were transiently expressed in different cell lines .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None