May act during the development and be a negative regulator. May also localize to internal membranes. Expressed throughout growth and development with a strong increase in early and late development. Cells show precocious development. Alterations are also noted at the slug stage and in spore formation. Slugs are longer and break apart several times on their way to culmination forming smaller but proportionate fruiting bodies. Spores from fruiting bodies are malformed and less viable, although the spore differentiation factors are synthesized and sensed normally. Mutant completes development 6 hours earlier. In the N-terminal section; belongs to the BMP lipoprotein family. In the C-terminal section; belongs to the G-protein coupled receptor 3 family. GABA-B receptor subfamily.