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:

Bcl-2: a repressor of lymphocyte death. The genes and mechanisms that control programmed cell death are currently the subject of intense study. The bcl-2 gene, a repressor of lymphocyte death, is perhaps the best understood of the programmed cell death associated genes. Here, Stanley Korsmeyer provides a brief overview of bcl-2, concentrating on its roles in B-and T-cell development and in oncogenesis.
{"CellLine": [], "CellType": ["lymphocyte"], "DNA": ["bcl - 2 gene"], "Protein": ["bcl - 2", "Bcl - 2", "The bcl - 2 gene"], "RNA": []}