Applying the dye to lab mice made their skin temporarily transparent, allowing Stanford University researchers to observe the rodents' digestive system, muscle fibers, and blood vessels, according to a study published September 5 in Science (<a href="https://www.science.org/doi/10.1126/science.adm6869" rel="nofollow">https://www.science.org/doi/10.1126/science.adm6869</a>)