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. Expressed predominantly during early aggregation and at low levels during later stage. C-terminal Ser or Thr residues may be phosphorylated. Belongs to the G-protein coupled receptor 5 family. 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.