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In Northern blot analysis , mRNA species of approximately 1.8 kilobases that hybridized with human FKBP cDNA were detected in poly(A)+ RNAs from brain , lung , liver , and placental cells and leukocytes .
 DNA: human FKBP cDNA; RNA: mRNA species; protein: FKBP; cell type: placental cells; cell type: leukocytes; RNA: poly(A)+ RNAs
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:
 DNA: human FKBP cDNA; RNA: mRNA species; protein: FKBP; cell type: placental cells; cell type: leukocytes; RNA: poly(A)+ RNAs