Fig. 2.

(A) Abundant antigen-specific staining in the cortex and, to a lesser extent, in the medulla of the thymus section of an experimental bird sacrificed on day 10. Scale bar = 100 µm. (B) Antigen-specifically stained cells both in the depleted cortical and medullar zones of the thymus section of an experimental bird sacrificed on day 12. Scale bar = 200 µm. (C) Antigen-specifically stained large hemocytoblasts in the bone marrow section of an experimental bird sacrificed on day 8. Scale bar = 100 µm. (D) Antigen-specifically stained hemocytoblasts and stem cells at different stages of differentiation in the bone marrow section of an experimental bird sacrificed on day 10. Scale bar = 50 µm. Immunoperoxidase stain.