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The recently discovered macrolide FK506 has been demonstrated to have potent immunosuppressive activity at concentrations 100-fold lower than cyclosporin A , a cyclic undecapeptide that is used to prevent rejection after transplantation of bone marrow and organs , such as kidney , heart , and liver .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
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