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:

Alpha-2B adrenergic receptor mediated hemodynamic profile of etomidate.
Etomidate has been used since 1972 as an inductor and in maintaining anesthesia. There are multiple mechanisms that account for the biologic effects of etomidate. One of the most prominent features of this drug is that it provides anesthesia without gross changes in hemodynamic parameters. This feature allows using etomidate in patients with considerable cardiopulmonary compromise avoiding the characteristic hypotension produced by other anesthetics. The mechanism that provides the basis for its cardiovascular stability is the capacity to bind and stimulate peripheral alpha-2B adrenergic receptors with a subsequent vasoconstriction. Alterations in the function or number of these receptors may account for abnormal responses during etomidate induction.
{"Chemical": ["Etomidate", "etomidate"], "Protein": ["Alpha-2B adrenergic receptor", "alpha-2B adrenergic receptors"]}