| 1. | Pituitary |
| 2. | Human pituitary |
| 3. | Human pituitary |
| 4. | Human pituitary |
| 5. | Human pituitary |
| 6. | Human pituitary |
| 7. | Thyroid |
| 8. | Thyroid and parathyroid glands |
| 9. | Thyroid follicles |
| 10. | Thyroid follicles |
| 11. | Thyroid gland of a dog |
| 12. | Rat thyroid follicle |
| 13. | Parathyroid of a monkey |
| 14. | Thyroid and parathyroid glands |
| 15. | Human parathyroid |
| 16. | Adrenal gland |
| 17. | Human adrenal gland |
| 18. | Adrenal cortex of a dog |
| 19. | Human adrenal cortex |
| 20. | Adrenal cortex |
| 21. | Human adrenal cortex |
| 22. | Adrenal gland of a dog |
| 23. | Pancreatic islet of Langerhans |
| 24. | Pancreatic islet of Langerhans |
| 25. | Pancreatic islet of Langerhans |
| 26. | Growing ovarian follicle |
| 27. | Human corpus luteum |
| 28. | Human corpus luteum |
| 29. | Human testis: Leydig cells |
| 30. | Leydig cells of the testis |
