The sporozoites undergo schizogony (merogony). MSP-1 is synthesized at the very beginning of schizogony, or asexual merozoite reproduction. Apicomplexans (sporozoans) replicate via ways of multiple fission (also known as schizogony). This trophozoite is the cell that begins the process of schizogony. This multiplication occurs either by merogony (binary fission) or schizogony (multiple fission). A cell currently undgergoing schizogony is known as a schizont. They are formed during a process called schizogony, which can also be called merogony. Exoerythrocytic schizogony occurs in the mononuclear phagocyte system. In apicomplexans, multiple fission, or schizogony appears either as merogony, sporogony or gametogony. Most species, however, appear to lack schizogony in their lifecycles. This then divides into a number of merozoites by schizogony. The zoites undergo two asexual cycles (schizogony). There is no specific number of nuclear divisions during schizogony. Garnham in 1947 described exoerythrocytic schizogony in "Hepatocystis (Plasmodium) kochi". The "P. vivax" sporozoite enters a hepatocyte and begins its exoerythrocytic schizogony stage.