47
From information available in the literature on the substrate specificity of the three enzymes , it is clear that a cysteine is not accepted in any of the S2 , S1 , S1' , and S2' subsites of cathepsin B and L , and not in the S1 and S1' subsites of cathepsin D .
 protein: enzymes; protein: S1'; protein: cathepsin D; protein: S1
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: enzymes; protein: S1'; protein: cathepsin D; protein: S1