The stomach, duodenum, jejunum and ileum of mice treated with (a–c) PBS buffer or (d–f) EMgMs with medium polymer coating thickness were collected and analyzed. At 24 hours post-treatment, the mice were sacrificed and GI tract tissue sections were stained with H&E assay (a, b, d, and e) and TUNEL assay (c, and f). Scale bar (a, d: 500 μm; b, c, e, and f: 100 μm).