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:

Clone pAT 133 identifies a gene that encodes another human member of a class of growth factor-induced genes with almost identical zinc-finger domains. We report the structure and regulation of a gene represented by clone pAT 133, which is induced upon transition from a resting state (G0) through the early phase of the cell cycle (G1). The pAT 133 gene is immediately induced, with FOS-like kinetics, in human T cells and in fibroblasts. Primary structure analysis showed that the encoded protein contains three tandem zinc-finger sequences of the type Cys2-Xaa12-His2. This zinc-finger region, which is thought to bind DNA in a sequence-specific manner, is similar (greater than 80% on the amino acid level) to two previously described transcription factors pAT 225 / EGR1 and pAT 591 / EGR2. Except for the conserved zinc-finger domains, the amino acid sequences of the three proteins are distinct. This structural similarity suggests that the pAT 133 gene encodes a transcription factor with a specific biological function. Comparing the regulation of these related zinc-finger-encoding genes showed coordinate induction upon mitogenic stimulation of resting T lymphocytes and of resting fibroblasts. However, upon transition from a proliferating (G1) to a resting state of the cell cycle the three genes were differently regulated. In human histiocytic U937 cells mRNA of clone pAT 133 was constitutively expressed, whereas mRNA of pAT 225 / EGR1 was induced upon induction of terminal differentiation. In contrast mRNA representing pAT 591 / EGR2 was not expressed in these cells. This difference in gene regulation suggests distinct biological roles in the control of cell proliferation for the respective proteins.
{"CellLine": ["human histiocytic U937 cells"], "CellType": ["resting fibroblasts", "resting T lymphocytes", "fibroblasts", "human T cells"], "DNA": ["pAT 133 gene", "clone pAT 133", "growth factor - induced genes", "the pAT 133 gene", "The pAT 133 gene", "Clone pAT 133", "the encoded protein", "zinc - finger - encoding genes"], "Protein": ["zinc - finger domains", "zinc - finger", "tandem zinc - finger sequences", "amino acid sequences", "transcription factors", "591 / EGR2", "pAT 225 / EGR1", "transcription factor", "FOS", "Cys2 - Xaa12 - His2", "zinc - finger region"], "RNA": ["mRNA", "human histiocytic U937 cells mRNA", "these cells"]}