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Fluorescein Di-β-D-Glucuronide, a fluorescent probe, can be utilized to non-invasively image the intestinal bacterial β-glucuronidase activity in nude mice. Fluorescein Di-β-D-Glucuronide-based imaging reveals the in vitro and in vivo activity of intestinal bacterial β-glucuronidase, which would facilitate pharmacodynamic studies of specific bacterial β-glucuronidase inhibitors in animal studies[1].

[1] Michael Chen, et al. Real-time imaging of intestinal bacterial β-glucuronidase activity by hydrolysis of a fluorescent probe. Sci Rep. 2017 Jun 9;7(1):3142. DOI:10.1038/s41598-017-03252-4