6070
The molecular masses of the proteins , determined by MALDI - TOF mass spectrometry , were 28 , 561 . 4 and 28 , 799 . 2 Da for Cdc SI and Cdc SII , respectively .
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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