Ep. 4: Normal Cell rescues bacteria from H. Pylori and joins U-1146 on patrol

Normal Cell, who wishes to save others, keeps four tiny bacteria as pets. AE3083 provides oxygen while U-1146 detects the creatures and confiscates them for disposal before heading to the stomach. Normal Cell follows, concerned for the bacteria. The stomach faces an attack by H. Pylori. Normal Cell saves the bacteria from falling debris, allowing one to defeat the H. Pylori so U-1146 can eliminate it. U-1146 identifies them as beneficial lactic acid bacteria. One bacterium remains in the stomach while the others stay with Normal Cell. U-1146 thanks him and invites him to join patrol. Later, they visit the small intestine, where a lactic acid bacterium consumes excess Purine and stays. Normal Cell accidentally drops another bacterium into a storm drain. U-1146 explains he lacks authority to stop immune cells from attacking it if mistaken for hostile, causing Normal Cell to cry and insult the immune cells. NK Cell arrives.

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