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Using an opsonophagocytic bacterial assay and a suckling rat model of GBS sepsis , we analyzed a modified human immunoglobulin for opsonic and protective antibody .
 human immunoglobulin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 human immunoglobulin