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:

Psychopharmacology of anticonvulsants: levetiracetam as a synaptic vesicle protein modulator.
ISSUE: A novel mechanism of action has recently been described for levetiracetam, a member of a new class of anticonvulsants. Levetiracetam binds selectively and with high affinity to a synaptic vesicle protein known as SV2A, thought to be involved with synaptic vesicle exocytosis and presynaptic neurotransmitter release.
{"Chemical": ["Levetiracetam", "levetiracetam"], "Protein": ["synaptic vesicle protein", "SV2A"]}