The relationships between weight and the correlation of the genes within glycine, serine and threonine metabolism. The correlation is between gene expressions and the fitted sinusoidal models and is set to identify circadian genes. The threshold for circadian genes is correlation > 0.8. The weights are evaluated from the SVD analysis. The absolute value of the weights represents the contribution of the individual genes to the pathway activity level. The genes that have higher correlation values have relatively higher absolute weights.