Figure 4From: Two Frequenins in Drosophila: unveiling the evolutionary history of an unusual Neuronal Calcium Sensor (NCS) duplicationEvolutionary models used in the ML analysis. Scheme of the evolutionary models compared in the codon model substitution-based ML analysis. ω0, ω1, ω3 and ω3 denote different dN/dS ratios. Model 1 (null model), Model 2 (alternative model 1) and Model 3 (alternative model 2) have 44, 45 and 46 free parameters (the degrees of freedom for each LRT is equal to the difference in the number of free parameters), respectively.Back to article page