Fig. 1
From: The potential for non-adaptive origins of evolutionary innovations in central carbon metabolism
High exaptation potential in central carbon metabolisms. a Fraction of metabolisms with exaptation index I>0 (y-axis) viable on some carbon source C (x-axis); b fraction of metabolisms (coded by shade of grey, see legend) with exaptation index I>0 that are viable on some carbon source C (x-axis) and have a given size (y-axis), c mean exaptation index of metabolisms viable on some carbon source C (x-axis), and d mean exaptation index (coded by shade of grey, see legend) of metabolisms viable on some carbon source C (x-axis) and with a given size (y-axis). White in (b) and (d) corresponds to metabolisms whose size is too small for viability on C