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We have characterized several 29-kDa proteins that are rapidly phosphorylated following exposure of intact human platelets to thrombin .
 protein: 29-kDa proteins; protein: thrombin; cell type: intact human platelets
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: 29-kDa proteins; protein: thrombin; cell type: intact human platelets