Peptide “Velcro”: design of a heterodimeric coiled coil.

Obelisks
Oblins
Viroid-like

https://en.m.wikipedia.org/wiki/Obelisk_(biology)

'Obelisks': Entirely New Class of Life Has Been Found in The Human Digestive System

https://www.sciencealert.com/obelisks-entirely-new-class-of-life-has-been-found-in-the-human-digestive-system

Viroid-like colonists of human microbiomes

https://pmc.ncbi.nlm.nih.gov/articles/PMC10827157/