Immunohistological analysis of human EB sections. EB culture designation, antibody epitope, and objective power are as follows: (A) BF1, muscle-specific actin, ×100. Arrow indicates a cell with eccentric nuclei and cytoplasmic filaments. (B) RI5, desmin, ×60. (C) BF1, CD34, ×60. (D) BF1, S-100, ×100. (E) RI5, S-100, ×60. (F) RI, pan-neurofilament, ×100. (G) BF1, α-1-fetoprotein, ×60. (H) BF1, pan-cytokeratin, ×60. (I) RI5, cytokeratin 7, ×60. (Bars represent 20 μm.)