4264
Mature human lymphocytes are unique targets of 1 alpha,25-dihydroxyvitamin D3 ( 1 alpha,25(OH)2D3 ) in that vitamin D receptors ( VDR ) are not constitutively expressed, and specific cellular activation signals are required for both the up-regulation of VDR and establishment of reactivity to the lipophilic ligand .
 protein: vitamin D receptors; protein: VDR; protein: VDR; cell type: human lymphocytes
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: vitamin D receptors, VDR, VDR, human lymphocytes 
Answer:
 protein: vitamin D receptors; protein: VDR; protein: VDR; cell type: human lymphocytes