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:

[ Changes in plasma interleukin-1 and their possible relationship with the changes in glucocorticoid receptor in aged long-distance runner ] For the study of the changes in plasma interleukin-1 (IL-1) and their possible relationship with the changes in glucocorticoid receptor (GR), plasma IL-1 and GR in peripheral blood leukocytes in aged long-distance runner were measured simultaneously. The activity of IL-1 was expressed as its ability to stimulate 3H-TdR incorporation in the thymocytes of C57 mice. GR was determined by whole cell assay with 3H-Dex. The results showed that the activity of plasma IL-1 in aged long-distance runner was 209%, 223% and 145% of the control at 14. 7-18. 7, 3. 8-7. 0 and 1. 5-2. 6 KD fractions. The GR in peripheral blood leukocytes in aged runner was 65% of the control. Possible relationship between the changes in IL-1 and GR in aged long-distance runner and its physiological significance are discussed.
{"CellLine": [], "CellType": ["peripheral blood leukocytes", "thymocytes"], "DNA": [], "Protein": ["plasma IL - 1", "glucocorticoid receptor", "GR", "plasma interleukin - 1 (IL - 1)", "plasma interleukin - 1", "3H - TdR", "IL - 1", "glucocorticoid receptor (GR)"], "RNA": []}