On a nice little paper that demonstrates pretty damn unequivocally that galaxies lose their gas in groups as well as clusters. This has been long suspected but this demonstrates that this "pre-processing" happens pretty much ubiquitously. It's really quite satisfying to see a trend as clear as this, most of the time things are a lot messier.
https://llittlephysicists.blogspot.com/2023/10/you-should-have-gone-before-we-came-out.html