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:

Activation of NF-kappa B by interleukin 2 in human blood monocytes. We report here that interleukin 2 (IL-2) acts on human blood monocytes by enhancing binding activity of the transcription factor NF-kappa B to its consensus sequence in the 5' regulatory enhancer region of the IL-2 receptor alpha chain (p55). Similarly, IL-2 activates NF-kappa B in the human monocytic cell line U 937, but not in resting human T-cells. This effect is detectable within 15 min and peaks 1 h after exposure to IL-2. Enhanced NF-kappa B binding activity is followed by functional activation in that inducibility of the IL-2 receptor alpha chain is mediated by enhanced NF-kappa B binding and that a heterologous promoter containing the NF-kappa B consensus sequence (-291 to-245) of the IL-2 receptor alpha chain gene is activated. In addition, IL-2 is capable of increasing transcript levels of the p50 gene coding for the p50 subunit of the NF-kappa B transcription factor, whereas mRNA levels of the p65 NF-kappa B gene remained unchanged.
{"CellLine": ["human monocytic cell line U 937"], "CellType": ["human blood monocytes", "resting human T - cells", "monocytes"], "DNA": ["IL - 2 receptor alpha chain", "5\u0027 regulatory enhancer region", "NF - kappa B gene", "IL - 2 receptor alpha chain gene", "- 291 to - 245", "NF - kappa B consensus sequence"], "Protein": ["p50", "the transcription factor NF - kappa B", "IL - 2 receptor alpha chain", "the NF - kappa B transcription factor", "transcription factor NF - kappa B", "interleukin 2 (IL - 2)", "p65", "interleukin 2", "NF - kappa B", "IL - 2", "p50 subunit", "p55"], "RNA": []}