CAT and colitis: At 5 days after induction of colitis, the levels of antioxidant defenses were significantly decreased (Figure 7B–D, respectively); however, treatment with Ulva (50 and 100 mg/kg) potentiated their activity as reported by the increase in colon tissue of GSH, CAT, and SOD contents compared to DNBS mice (Figure 7B–D, respectively).