 Metagenomic analysis highly supports the notion that these genes promote viral replication through the degradation of host DNA and RNA, as well as a shift in host-cell metabolism to nucleotide biosynthesis.Cyanophages also use these genes to maintain host photosynthesis through the progression of the infection, shuttling the energy away from carbon fixation to anabolism, which the virus takes advantage of.AMGs also code for proteins, which aid in the repair of the host photosystem, which is susceptible to photodegradation.