You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["RNA", "CellLine", "Protein", "DNA", "CellType"].

Please return the output as a JSON object of the format: {"DNA" : ["TAL1", ...], "RNA": ["mRNAs", ...], "CellLine": ["T cells", ...], "CellType": ["monocytes", ...], "Protein": ["IL-2", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Vitamin D receptor expression in human lymphocytes. Signal requirements and characterization by western blots and DNA sequencing. The signals controlling the expression of the receptor protein for 1 alpha, 25-dihydroxyvitamin D3 in normal human lymphocytes and the relationship of this protein to the classical vitamin D receptor were examined. Lymphocytes activated with the OKT3 antibody to the T-cell antigen receptor expressed fewer binding sites as compared to lymphocytes that were activated by the polyclonal activator phytohemagglutinin (PHA). However, combination of OKT3 and phorbol myristate acetate produced a concentration of binding sites similar to the PHA-activated cells. The receptor from OKT3 and OKT3 + phorbol myristate acetate-activated lymphocytes exhibited decreased binding to DNA-cellulose compared to PHA-activated lymphocytes. In lymphocytes activated either by PHA or OKT3 (but not in resting cells), a 50-kDa species cross-reacting with a monoclonal antibody against the intestinal vitamin D receptor was detected. Finally, RNA from activated lymphocytes was amplified by polymerase chain reaction using oligonucleotide primers flanking the 196 base pair long region encoding the DNA-binding domain of the human intestinal receptor. The amplified product showed an identical nucleotide sequence to the DNA-binding domain of the human intestinal receptor. These findings suggest that expression of the 1, 25- (OH) 2D3 receptor in lymphocytes is triggered by distinct and contingent signals, and that the protein and the mRNA encoding it are identical to the classical vitamin D receptor.
{"CellLine": ["PHA - activated cells"], "CellType": ["resting cells", "PHA - activated lymphocytes", "lymphocytes", "activated lymphocytes", "Lymphocytes", "human lymphocytes", "- activated lymphocytes"], "DNA": ["identical nucleotide sequence", "196 base pair long region"], "Protein": ["PHA", "T - cell antigen receptor", "50 - kDa species", "OKT3", "phytohemagglutinin", "intestinal vitamin D receptor", "1 , 25 - (OH) 2D3 receptor", "vitamin D receptor", "monoclonal antibody", "human intestinal receptor", "Vitamin D receptor", "classical vitamin D receptor", "DNA - binding domain", "OKT3 antibody", "receptor protein"], "RNA": ["mRNA", "RNA"]}