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: ["Protein", "Chemical"].

Please return the output as a JSON object of the format: {"Chemical" : ["Dexamethasone", ...], "Protein" : ["BRCA-1", ...]}. 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:

[Change of dopamine transporter activity (DAT) during the action of bupropion (in depression)].
Bupropion has an antidepressant effect through blocking the dopamine transporter. By 99mTc-TRODAT-SPECT, we measured the baseline DAT activity of depressed patients. After 3 weeks' bupropion treatment we studied the change in DAT activity, which corresponds to the occupancy of bupropion. The average occupancy of bupropion on DAT was similar to the international findings at 20.84% in 9 depressed patients.
{"Chemical": ["bupropion", "Bupropion", "dopamine"], "Protein": ["DAT", "dopamine transporter"]}