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:

Photoaffinity labeling of plasma membrane receptors for aldosterone from human mononuclear leukocytes. Non-genomic effects of aldosterone on the sodium-proton-antiport have been shown in human mononuclear leukocytes which could be related to a new aldosterone membrane receptor. In the present paper plasma membranes from human mononuclear leukocytes were covalently photolabeled with a [125I]-aldosterone derivative. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed significant aldosterone binding at a molecular weight of approximately 50000 Dalton which was absent with 1 microM cold aldosterone, but not cortisol in the binding media. The presence of the sulfhydryl agent dithiothreitol did not affect results suggesting the absence of disulfide bridges in the steroid binding domain of the receptor. These data are the first to define the molecular weight of the membrane receptor for aldosterone.
{"CellLine": [], "CellType": ["human mononuclear leukocytes"], "DNA": [], "Protein": ["plasma membrane receptors", "sodium - proton - antiport", "disulfide bridges", "steroid binding domain", "membrane receptor", "aldosterone membrane receptor"], "RNA": []}