[nicolaslegland]

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6027462/ TL;DR: Biotic implies L-chirality. Ryugu exhibits balanced chirality.

[kevviiinn]

Earth biotic origin implies L, I think it is theoretically possible if life developed elsewhere that other enzymes may preference R. AFAIK our enzymes are generally conserved throughout life

[madaxe_again]

Indeed. Asimov’s “Left hand of the electron” has an essay which explores and explains why life inevitably ends up with a chiral preference.

[_a_a_a_]

"Biotic implies L-chirality" on this planet sure, but it's one data point to extrapolate from. It's not enought.

[nicolaslegland]

This is the data point we discuss panspermia vs abiogenesis upon, R-chirality couldn't have spawned the L-chirality lineage here.