Figure 2From: In silico ribozyme evolution in a metabolically coupled RNA populationNeighbourhoods used in the model. Neighbourhoods defined in the model. Dark grey sites constitute the replication neighbourhood of the empty site X (von Neumann neighbourhood in this case). Light grey sites are the metabolic neighbourhood of replicator R1 (3×3 Moore neighbourhood). R i (i = 1,2,3, 4) are replicators.Back to article page