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:

A lymphoid cell-specific nuclear factor containing c-Rel-like proteins preferentially interacts with interleukin-6 kappa B-related motifs whose activities are repressed in lymphoid cells. The proto-oncoprotein c-Rel is a member of the nuclear factor kappa B transcription factor family, which includes the p50 and p65 subunits of nuclear factor kappa B. We show here that c-Rel binds to kappa B sites as homodimers as well as heterodimers with p50. These homodimers and heterodimers show distinct DNA-binding specificities and affinities for various kappa B motifs. In particular, the c-Rel homodimer has a high affinity for interleukin-6 (IL-6) and beta interferon kappa B sites. In spite of its association with p50 in vitro, however, we found a lymphoid cell-specific nuclear factor in vivo that contains c-Rel but not p50 epitopes; this factor, termed IL-6 kappa B binding factor II, appears to contain the c-Rel homodimer and preferentially recognizes several IL-6 kappa B-related kappa B motifs. Although it has been previously shown that the IL-6 kappa B motif functions as a potent IL-1 / tumor necrosis factor-responsive element in nonlymphoid cells, its activity was found to be repressed in lymphoid cells such as a Jurkat T-cell line. We also present evidence that IL-6 kappa B binding factor II functions as a repressor specific for IL-6 kappa B-related kappa B motifs in lymphoid cells.
{"CellLine": ["Jurkat T - cell line"], "CellType": ["lymphoid cells", "nonlymphoid cells"], "DNA": ["IL - 1 / tumor necrosis factor - responsive element", "IL - 6", "IL - 6 kappa B motif", "beta interferon kappa B sites", "kappa B sites", "several IL - 6 kappa B - related kappa B motifs", "interleukin - 6 (IL - 6)", "interleukin - 6 kappa B - related motifs", "kappa B motifs", "interleukin - 6", "IL - 6 kappa B - related kappa B motifs", "the IL - 6 kappa B motif"], "Protein": ["p50", "heterodimers", "p65 subunits", "IL - 6", "c - Rel", "p50 epitopes", "c - Rel - like proteins", "proto - oncoprotein c - Rel", "nuclear factor kappa B", "c - Rel homodimer", "homodimers", "nuclear factor kappa B transcription factor family", "interleukin - 6", "IL - 6 kappa B binding factor II", "lymphoid cell - specific nuclear factor"], "RNA": []}