Article Correctness Is Author's Responsibility: Polysaccharides From Red Algae Affect the Immune System December 29, 2020 Author: Neuroscience News Category: brain researchThe article below may contain offensive and/or incorrect content. Biologically active polysaccharides from red algae known as carrageenan appear to suppress the activity of peritoneal phagocytes in mice, generating an immunosuppressant effect.