Receptor for cAMP. Coordinates the aggregation of individual cells into a multicellular organism and regulates the expression of a large number of developmentally regulated genes. The activity of this receptor is mediated by G proteins. Induced at early aggregation (6 hours) and maximally expressed at the mound stage (9-12 hours), level of expression peaks again during the slug stage (18 hours) and declines at culmination. C-terminal Ser or Thr residues may be phosphorylated. Belongs to the G-protein coupled receptor 5 family. It is uncertain whether Met-1 or Met-15 is the initiator.