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Samples from 4 individual healthy human donors were pre - incubated for 2 hours at the indicated concentration of Ab - 01 or the control IgG1TM prior to addition of 10 ng / mL rhIL21 and 2 hr incubation , and the effect on the 6 biomarkers was then assessed ( Figures 4 and 5 ) .
 Anatomy: Samples
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: Samples