| 1. | Thyroid gland and parathyroid gland |
| 2. | Pituitary gland and pineal gland |
| 3. | Adrenal gland and thymus |
| 4. | Pineal gland and thyroid gland |
| 1. | Deficiency of thyroxine |
| 2. | Disruption of activity of pineal gland |
| 3. | Overproduction of MSH |
| 4. | Deficiency of thymosin |