11733
Moreover, the inhibitors of serine proteases , N-alpha-tosyl-L-lysine chloromethyl ketone and N-alpha-tosyl-L-phenylalanine chloromethyl ketone , also blocked the cytolytic activity of NK cells against the sensitive target K562 .
 protein: serine proteases; cell type: NK cells; cell line: K562
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: serine proteases, NK cells, K562 
Answer:
 protein: serine proteases; cell type: NK cells; cell line: K562