1. Title page 2. Somatotroph 3. Periodic bursting 4. The model 5. Slow manifold 6. Bifurcation diagram 7. Overlay trajectory 8. The question 9. Phase-resetting 10. Manifold computations 11. Before animated 12. Before homoclinic 13. At homoclinic I 14. At homoclinic II 15. After animated 16. After homoclinic I 17. After homoclinic II 18. Summary		Model based on Hodgkin-Huxley V : Voltage potential across the cell membrane (very fast) m : fraction of open K channels (fast) n : fraction of open delayed K channels (fast) Ca : Ca concentration in the cell (slow)