This cell-surface glycoprotein mediates cell-cell binding via homophilic interaction. Attached to the membrane by a GPI-anchor that contains a phosphoceramide moiety. Such anchor mediates a fast and long persistence cell adhesion of the protein. Restricted to the aggregation stage of development of D.discoideum. The C-terminal region contains clusters of proline regularly alternating with a hydroxyamino acid. This domain might act as a spacer to elevate sites active in cell contact into the extracellular space. Phosphorylated on serine and N-glycosylated with two types of oligosaccharide chains. The GPI-like-anchor contains a phosphoceramide group, rather than a phosphatidyl group. The expression of this stringently regulated protein during cell development is mediated through cell-surface cAMP receptors. The Dictyosteliida are known to produce a glycosylsphingolipidinositol anchor (GPI-like-anchor). It has not been established whether Dictyosteliida make a glycosylphosphatidylinositol anchor (GPI-anchor) also, and whether their GPI-like-anchor modifications can be interconverted with GPI-anchor modifications in a resculpting process. It has not been established that the GPI-like-anchor modification in Dictyosteliida utilizes the same sequence motif.