AAMP is an immunoglobulin-type protein. It is found to be expressed strongly in endothelial cells, cytotrophoblasts, and poorly differentiated colon adenocarcinoma cells found in lymphatics.

The protein contains a WD40 domain and a heparin-binding domain which mediates heparin-sensitive cell adhesion.The predicted 452-amino acid, 49-kD protein contains a heparin-binding consensus sequence near the N terminus, an acidic region, immunoglobulin-like domains which identify it as an immunoglobulin superfamily member, 6 repeats with varying degrees of similarity to the WD40 repeat, and 1 potential transmembrane region. The authors detected a 1.6-kb AAMP transcript and a 52-kD AAMP protein in human tissues and cells.