The second involves the idea of equality as a necessary characteristic of the units or subunits that are used.

actin subunits per helical turn, myosin V has a relatively long step length of 74 nm.

The protein subunits in a virus capsid are multiply redundant, i.e. present in many copies per particle.

composed of three subunits encoded by distinct genes: a, b, and g.

disulfide chemistry, these subunits are allowed to assemble around a guest.