Figure 1From: Prebiotic replicase evolution in a surface-bound metabolic system: parasites as a source of adaptive evolutionThe metabolic system. a: I1..4 are the metabolic replicators; M is metabolism. Dashed arrows represent the supply of metabolites (monomers) used for replication; solid circular arrows show replication; dashed-dotted arrows mean the catalytic effect of metabolic replicators helping metabolism. b: Parasitisation of the metabolic system: the parasitic replicator P uses the monomers supplied by metabolism but it does not help producing them.Back to article page