5661
In contrast, APC pulsed with Ala -substituted peptides 430-444 , 442A or 433-442A at neutral pH failed to stimulate the T cell clone , while APC pulsed at acidic pH and subsequently washed led to successful T cell activation .
 cell type: APC; cell type: APC; cell line: T cell clone
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: APC, APC, T cell clone 
Answer:
 cell type: APC; cell type: APC; cell line: T cell clone