[henry_bone]

My bad on the missing 'the'. Mechanism is in the abstract. Of course it is. I see it now. Sorry about that.

Probably wise to mention your PhD here on HN. Nerds (apart from me) are the finest proof readers and grammar checkers the world has ever seen.

Seriously, all the best on your PhD submission. Sorry for the confusion.

[alexholehouse]

Not at all - there's some additional text that provides set-up for the idea of mechanism. Re-reading it now cold, I read it exactly as you (and others) did as well. And I (embarrassingly) am relatively confident I wouldn't have caught the categories/categorise error, huge thank you!