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:

Assessment of effects of IR and IPC on activities of cytochrome P450 isozymes in rats by a five-drug cocktail approach.
Abstract Background and objective: To evaluate the effects of ischemia and reperfusion (IR) and ischemic preconditioning (IPC) on the metabolic activities of cytochrome P450 (CYP) isozymes in rats by a five-drug cocktail approach. Methods: Cocktail approach was used to evaluate the influence of IR and IPC on the activities of CYP1A2, CYP2C9, CYP2E1, CYP2D6 and CYP3A4, which were reflected by the changes of pharmacokinetic parameters of five specific probe drugs: caffeine, chlorzoxazone, tolbutamide, metoprolol and midazolam, respectively. Rats were randomly divided into IR, IPC and sham groups, and then injected the mixture of five probe drugs. Blood samples were collected at a series of time-points and the concentrations of probe drugs in plasma were determined by a HPLC method with UV detection. The pharmacokinetic parameters were calculated by the software of DAS 2.0. Results: The parameters including t(1/2β), CLs, AUC, MRT and K(10) exhibited a similar tendency for both IR and IPC groups. Compared with sham group, CLs and K(10) of five probe drugs were significantly lower (p < 0.05), AUC and t(1/2β) of five or some probe drugs were significantly increased in IR and IPC groups (p < 0.05). Compared with IPC group, CLs of five probe drugs were decreased and AUC were significantly increased in the IR group (p < 0.05). Conclusion: IR can variably decrease the activities of CYP isozymes in rats and this decrease can be attenuated by IPC.
{"Chemical": ["metoprolol", "caffeine", "tolbutamide", "chlorzoxazone", "midazolam"], "Protein": ["CYP isozymes", "CYP3A4", "CYP", "CYP1A2", "cytochrome P450", "CYP2C9", "CYP2E1", "CYP2D6"]}