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After ELISA screening , mAb 18C7 was selected for its specificity towards the HBD .
 HBD, mAb 18C7
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 HBD, mAb 18C7