17901
Brilliant applications of single - domain antibody - dependent imaging have enabled us to understand how the tracer mass and avidity can be engineered to modulate pharmacokinetic features such as clearance , tumor penetration , and binding affinity with the aim of optimizing specific responses .
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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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