[leguminous]

Here's the original paper: https://www.nature.com/articles/s41467-019-09730-9

This is all I saw to address the pressures required:

> Our higher operating pressures do not represent a barrier for applications because they can be generated by a small load in a large volume of material via a pressure-transmitting medium, e.g., using a vessel with a neck containing a driving piston, whose small area is compensated by its distance of travel.