1. Plant cells in the onion peel. Hematoxylin and eosin.

15. Human amnion. Hematoxylin and eosin.

12. Cross-section of a chicken embryo at the stage of initial differentiation of mesoderm.

13. Fertilization. Hematoxylin.

14. Synkaryon. Hematoxylin.

6. Pigment inclusions in melanocytes. Not stained.

16. Umbilical cord. Hematoxylin and eosin.

2. Animal liver cells of axolotl. Hematoxylin and eosin.

8. Glycogen inclusions in hepatocytes. Best’s carmine.

9. Mitosis in the plant cells (onion root section). Iron hematoxylin.

4. Golgi apparatus in nerve cells. Osmic acid.

11. Oocyte in the ovary of a cat. Hematoxylin and eosin.

17. Allantois. Hematoxylin and eosin.

3. Mitochondria. Altman’s acid fuchsin.

10. Amitosis in the epithelial cells of the urinary bladder (smear). Hematoxylin and eosin.

5. Centrosome in ascarid’s cells. Hematoxylin.