However, with the increase in animal phyla such as Mollusca, for example, the Pacific oyster (Crassostrea gigas or C. gigas), the involvement of cGAS/STING signaling-mediated production of primitive interferon-like protein (IFN-LP) has been observed upon viral infection as a defense mechanism [141,142,143]. The gene discussed is CGAS; the disease is viral infectious disease.