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 novel mitogen-inducible gene product related to p50 / p105-NF-kappa B participates in transactivation through a kappa B site. A Rel-related, mitogen-inducible, kappa B-binding protein has been cloned as an immediate-early activation gene of human peripheral blood T cells. The cDNA has an open reading frame of 900 amino acids capable of encoding a 97-kDa protein. This protein is most similar to the 105-kDa precursor polypeptide of p50-NF-kappa B. Like the 105-kDa precursor, it contains an amino-terminal Rel-related domain of about 300 amino acids and a carboxy-terminal domain containing six full cell cycle or ankyrin repeats. In vitro-translated proteins, truncated downstream of the Rel domain and excluding the repeats, bind kappa B sites. We refer to the kappa B-binding, truncated protein as p50B by analogy with p50-NF-kappa B and to the full-length protein as p97. p50B is able to form heteromeric kappa B-binding complexes with RelB, as well as with p65 and p50, the two subunits of NF-kappa B. Transient-transfection experiments in embryonal carcinoma cells demonstrate a functional cooperation between p50B and RelB or p65 in transactivation of a reporter plasmid dependent on a kappa B site. The data imply the existence of a complex family of NF-kappa B-like transcription factors.
{"CellLine": ["embryonal carcinoma cells"], "CellType": ["human peripheral blood T cells", "T cells"], "DNA": ["Rel domain", "900 amino acids", "open reading frame", "reporter plasmid", "cDNA", "immediate - early activation gene", "kappa B sites", "kappa B site"], "Protein": ["p50B", "NF - kappa B - like transcription factors", "carboxy - terminal domain", "p65", "heteromeric kappa B - binding complexes", "p50", "full cell cycle", "p50 - NF - kappa B", "ankyrin repeats", "mitogen - inducible gene product", "RelB", "vitro - translated proteins", "p97", "NF - kappa B", "p50 / p105 - NF - kappa B", "Rel - related , mitogen - inducible , kappa B - binding protein", "kappa B - binding , truncated protein", "the repeats", "amino - terminal Rel - related domain", "97 - kDa protein"], "RNA": []}