Fig. 1

Seasonal changes in hematopoiesis in the bone marrow. Frozen sections of frog tibias obtained in July (a, b) or in February (c, d) were double-stained with Oil Red O and hematoxylin. Scale bars indicate 500 µm (a, c) or 20 µm (b, d). Adipocytes (a), granulocytes (g) and erythrocytes (e) are indicated