This is irresistible. In a paper published in the journal Cell Metabolism, biologists at the University of Cambridge use an imaging method to:
uncover a central role for the Drosophila intestine in the regulation of nutrient intake, fluid, and ion balance.
Isn't this a lovely example of the beauty of nature, even if it is hidden in the digestive tract of a fruit fly?
These pictures are stunning. I loved looking at them because I spent 4 years of my life studying the development of the fly renal tubules (which arise at the junction between the hindgut and midgut as in the first pic you posted). People used to back away from me slowly at parties when I started going on about how beautiful they were--wish I'd had pics like this to show them!