Figure 5: Antihistamine activity of PSAO in skipjack tuna fish after 30 minutes at 37°C (PLP: pyridoxal 5-phosphate (4 μmol mL-1); SEC-PSAO (4 unit mL-1); PSH: filtrate of pea seedling homogenate (4 unit mL-1). Different letters indicate a significant difference (Duncan; p<0.05).