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To understand the mechanism of leukemic cell infiltration into organs , we studied the expression and regulation of L-selectin mRNA in fresh leukemic cells of adult T-cell leukemia ( ATL ) patients and investigated the response of the L-selectin promoter to human T-cell lymphotropic virus type 1 ( HTLV-1 ) Tax , which is a viral transcriptional transactivator .
 protein: L-selectin; protein: L-selectin; cell type: leukemic cell; cell type: leukemic cells; protein: human T-cell lymphotropic virus type 1 ( HTLV-1 ) Tax; protein: viral transcriptional transactivator; DNA: L-selectin promoter; RNA: L-selectin mRNA
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:
 protein: L-selectin; protein: L-selectin; cell type: leukemic cell; cell type: leukemic cells; protein: human T-cell lymphotropic virus type 1 ( HTLV-1 ) Tax; protein: viral transcriptional transactivator; DNA: L-selectin promoter; RNA: L-selectin mRNA