Fluorescence imaging was performed using a multimodal IVIS Lumina XR imaging system (PerkinElmer). The mice were euthanised by cervical dislocation, followed by exposure of the abdominal cavity and removal of the intestine from the stomach to the rectum [33 (link)]. The instrument background fluorescence was removed using an adaptive fluorescence background subtraction tool. Images were analysed using Living Image version 4.3.1 [33 (link)].
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