Comparison of enzymatic activities in sporulating SK1 MAT a/α cells and sporulation-deficient SK1 MAT α/α cells after transfer to sporulation medium. Enzymes were grouped according to similar correlations between their activities in the sporulating and the non-sporulating strain. Columns correspond to time points after transfer from YPA to sporulation medium. Each row corresponds to an enzymatic activity summarizing (left panel) the ratio between the enzymatic activity in sporulating and non-sporulating cells, (middle panel) the normalized enzymatic activity in sporulating cells, and (right panel) the normalized enzymatic activity in non-sporulating cells. Activities were normalized to their maximum value observed over the whole time course. The activities are provided in Additional file 8. Data represent the average of at least two independent experiments.