Immunocytochemical staining of bone marrow cells.

(A) Negative control; no staining was observed with a control immunoglobulin. (B) Intracellular red staining was observed with specific monoclonal anti-HGF antibodies; (Pr indicates promyelocyte; My, myelocyte; Mt, metamyelocyte; B, band cell; S, segmented cell). Smears were examined by light microscopy at × 800.