SNAI1 and posterior cortical atrophy: To determine whether the sialic acids present on the cell surface of the PCa cells were α2,3-linked and α2,6-linked, we utilized Sambucus nigra agglutinin (SNA) to detect α2,6-linked sialic acids and Maackia amurensis agglutinin II (MALII) to detect α2,3-linked sialic acids by flow cytometry.