Maackia amurensis Lectin (MAA/MAL II) is a plant lectin. Maackia amurensis Lectin (MAA/MAL II) has specific sugar recognition properties and is able to bind to molecules containing specific sugar structures, especially the α-2, 3-linked Lactaminic acid , which can be used as a probe to specifically bind biomolecular molecules. Maackia amurensis Lectin (MAA/MAL II) can be used for the discovery of disease-related biomarkers and the study of cancer pathologic mechanisms.