4634
Using identical reaction mixtures , surfaces that presented the substrate at high density led to a phosphorylated peptide at steady - state , whereas surfaces that presented the substrate at low density led to unphosphorylated peptide at steady - state .
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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:
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