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:

Isolation of a rel-related human cDNA that potentially encodes the 65-kD subunit of NF-kappa B [ published erratum appears in Science 1991 Oct 4; 254 (5028): 11 ] A DNA probe that spanned a domain conserved among the proto-oncogene c-rel, the Drosophila morphogen dorsal, and the p50 DNA binding subunit of NF-kappa B was generated from Jurkat T cell complementary DNA with the polymerase chain reaction (PCR) and degenerate oligonucleotides. This probe was used to identify a rel-related complementary DNA that hybridized to a 2. 6-kilobase messenger RNA present in human T and B lymphocytes. In vitro transcription and translation of the complementary DNA resulted in the synthesis of a protein with an apparent molecular size of 65 kilodaltons (kD). The translated protein showed weak DNA binding with a specificity for the kappa B binding motif. This protein-DNA complex comigrated with the complex obtained with the purified human p65 NF-kappa B subunit and binding was inhibited by I kappa B-alpha and-beta proteins. In addition, the 65-kD protein associated with the p50 subunit of NF-kappa B and the kappa B probe to form a complex with the same electrophoretic mobility as the NF-kappa B-DNA complex. Therefore the rel-related 65-kD protein may represent the p65 subunit of the active NF-kappa B transcription factor complex.
{"CellLine": [], "CellType": ["human T and B lymphocytes"], "DNA": ["Jurkat T cell complementary DNA", "kappa B probe", "rel - related complementary DNA", "proto - oncogene c - rel", "rel - related human cDNA", "DNA probe", "complementary DNA", "kappa B binding motif"], "Protein": ["p50 DNA binding subunit", "p50", "p65 subunit", "65 kilodaltons", "65 - kD protein", "Drosophila morphogen dorsal", "I kappa B - alpha", "active NF - kappa B transcription factor complex", "NF - kappa B - DNA complex", "65 - kD subunit", "protein - DNA complex", "- beta proteins", "NF - kappa B", "rel - related 65 - kD protein", "p50 subunit", "purified human p65 NF - kappa B subunit"], "RNA": ["2 . 6 - kilobase messenger RNA"]}