Adenosine deaminase that may contribute to the degradation of extracellular adenosine, a signaling molecule that controls a variety of cellular responses. May play a role in the regulation of cell proliferation. adenosine + H(+) + H2O = inosine + NH4(+) Binds 1 zinc ion per subunit. Dense core vesicles (DCV). Detected in egg cordons and in the developiong central nervous system. Not detected in adult central nervous system (at protein level). Atrial gland. Belongs to the metallo-dependent hydrolases superfamily. Adenosine and AMP deaminases family. ADGF subfamily.