According to Oparin, the organic molecules after having come into exist­ence became organised into supramolecular structures of some types. These supramoleculer structures are called coecervates. A coecervate may be defined as a solution made up of high molecular weight chemicals.

Ac­cording to Oparin, under certain special circumstances the coecervate separates into two phases – The sol phase and the gel phased. The gel phase in contact with aqueous solution shows great osmotic activity and brings about oxidation, reduction and polymerisation. Oparin called these sys­tems as protobiont. It is these protobiont which subsequently must have given rise to protoplasm.