Fig. 4. Immunostaining of EBs with ExE markers. Anti-COUP-TF1 (A), anti-Gata4 (B), anti-Krt19 (C) and anti-Foxa2 (D) antibodies were used for immunostaining of EBs grown with (+) or without (–) Tet in LIF-supplemented medium. Two independent clones gave similar results. Bars, 100 µm.