Combining with activin and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. Activin is one of two gonadal glycoproteins related to transforming growth factor beta. [GOC:mah, GOC:signaling, ISBN:0198506732]
Full description or abstract
Collection
C5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function