7209
The advantages offered by the avidity power of the venom specific antibodies ( VS - Abs ) obtained after one step purification , outweigh the specificity of the species - specific antibodies ( SS - Abs ) obtained after further purification .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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