RACS attenuated H. pylori-induced histological and ultrastructural damages. (a) Typical microscopic images by HE staining of gastric mucosa: (A) natural control group (NC), (B) HP model group (HP), (C) standard triple therapy group (RAC), (D) standard triple therapy+sucralfate group (RACS), and (E) bismuth-containing quadruple therapy group (RACB). Scale bar: 200 μm. (b) Transmission electron micrograph images: (A) NC, (B) HP, (C) RAC, (D) RACS, and (E) RACB. Scale bar: 2 μm.