Both avian and non-avian reptiles excrete excess nitrogen in solid form — colloquially termed ‘urates’ — as an evolutionary adaptation that aids in water conservation. Yet, there are many open questions regarding the composition, structure, and assembly of these biogenic materials. In new research, scientists from Georgetown University, International Centre for Diffraction Data, Chiricahua Desert Museum and Georgia State University...
 
 
![Chemical structure of the cyclo[48]carbon [4]catenan. Image credit: Harry Anderson.](https://cdn.sci.news/images/2025/08/image_14141-Cyclo-48-Carbon-195x110.jpg) 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 