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:

Interleukin-3 expression by activated T cells involves an inducible, T-cell-specific factor and an octamer binding protein. Interleukin-3 (IL-3) is exclusively expressed by activated T and natural killer cells, a function that is tightly controlled both in a lineage-specific and in a stimulation-dependent manner. We have investigated the protein binding characteristics and functional importance of the ACT-1-activating region of the IL-3 promoter. This region binds an inducible, T-cell-specific factor over its 5' end, a site that is necessary for the expression of IL-3 in the absence of other upstream elements. Over its 3' end, it binds a factor that is ubiquitously and constitutively expressed. This factor is Oct-1 or an immunologically related octamer-binding protein, and it plays a role in coordinating the activity of several regulatory elements. These characteristics make the ACT-1 site analogous to the activating ARRE-1 site in the IL-2 promoter. Furthermore, and despite a lack of sequence homology, the promoters of IL-3 and IL-2 share an organizational pattern of regulatory elements that is likely to be important for the T-cell-specific expression of these genes.
{"CellLine": [], "CellType": ["activated T", "natural killer cells", "activated T cells"], "DNA": ["ACT - 1 site", "5\u0027 end", "regulatory elements", "IL - 2 promoter", "ACT - 1 - activating region", "3\u0027 end", "IL - 2", "ARRE - 1 site"], "Protein": ["Interleukin - 3 (IL - 3)", "T - cell - specific factor", "IL - 3", "Interleukin - 3", "octamer binding protein", "immunologically related octamer - binding protein", "IL - 2", "Oct - 1"], "RNA": []}