Fig. 1: Comparison of catalytic pathways between biological and model systems.
From: Emergence of a short peptide based reductase via activation of the model hydride rich cofactor

Schematic representation of reduction reaction using a modern enzyme-bound cofactor NADPH, b short peptide-based nanostructures with surface-bound model cofactor NaBH4. c Chemical structures of the model cofactor, the substrates used, and the products. d Representation of reduction reaction using only cofactors in aqueous milieu. e Chemical structures, extended β-strand configurations, and abbreviations of the cationic peptide sequences.