Protobionts

Protobionts are excitable, metabolically active, inaccurately reproducing protein clusters.  These clusters form when their protein parts are mixed with cold water:  they self-assemble into microspheres.  Protobionts also can release voltage like a neuron because some protobionts store energy through a similar method of membrane potential as organelles.  If coated with a semipermeable membrane, a protobiont will swell and contract osmotically when in solutions of differing salt concentrations.  The protobiont shares its weak catabolic capabilities with the liposome.

Liposomes

Liposomes are also droplets that form but differ in the respect that the ingredients include certain lipids.  Hence, liposomes have a lipid bilayer separating proteins from the environment.  Liposomes behave dynamically by engulfing smaller liposomes then splitting into two smaller liposomes.

Adding Liposomes and Enzymes

This creates the ability for the liposome to absorb a substrate and "spit out" a transformed product acted upon by the enzymes in the lipid bilayer.

Coacervates

A coacervate is simply a liposome with enzymes in the lipid bilayer and inside.

Next:  "The Origins of Replication."