Galactose- and N-acetylgalactosamine-binding lectin. May play a role in cell-substratum adhesion rather than in cell-cell adhesion. May be necessary for the maintenance of normal elongate morphology during aggregation. Tetramer of four different chains (A to D). Stalk cells. The gene for this protein is duplicated in strains AX3 and AX4. These strains contain a duplication of a segment of 750 kb of chromosome 2 compared to the corresponding sequence in strain AX2.