A 10 mg/ml solution of 4-hydroxy-tamoxifen was prepared in a mixture of autoclaved sunflower oil (9 part) and ethanol (1 part) with end-to-end rotation for 1 h at room temperature and stored at 4 °C in a light-proof container. Six-week old mice were injected intraperitoneally with 2 mg (200 uL) tamoxifen for 3 subsequent days. Control mice received equal volume of the oil-ethanol vehicle. Mice were processed for immunostaining after 2 weeks of injections.
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