Immunohistochemistry of TG(zpu.1:EGFP)^df5 adult kidney marrow. (A-C) Transverse sections showing EGFP-positive cells in the kidney marrow of transgenic adults at progressively increased magnification, and (D) transverse section of the kidney of transgenic fish analyzed with zebrafish pu.1 antisense RNA. T indicates renal tubule. Original magnifications × 100 (A), × 200 (B), and × 1000 (C-D). Arrows indicate positive cells.