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:

Amantadine induces c-fos in rat striatum: reversal with dopamine D1 and NMDA receptor antagonists.
Amantadine (1-aminoadamantane) induced Fos expression in the central, dorsal-medial and ventral-medial part of the striatum. The distribution pattern of Fos induced by amantadine was more similar to those seen with dopaminomimetics than with N-methyl-D-aspartate (NMDA) receptor antagonists. Pretreatment with the dopamine D1 receptor antagonist, SCH23390, and the NMDA receptor antagonist, MK-801, blocked amantadine induction of Fos in the striatum. However, amantadine induction of Fos in the striatum was unaffected by the dopamine D2 receptor antagonist, sulpiride. These results suggest that amantadine induction of Fos in the rat striatum is related to dopamine D1 and NMDA receptors.
{"Chemical": ["N-methyl-D-aspartate", "sulpiride", "MK-801", "NMDA", "dopamine", "1-aminoadamantane", "amantadine", "Amantadine", "SCH23390"], "Protein": ["dopamine D1", "Fos", "N-methyl-D-aspartate (NMDA) receptor", "NMDA receptor", "dopamine D2 receptor", "dopamine D1 receptor", "NMDA receptors", "c-fos"]}