Wikipedia
S-phase (synthesis phase) is the part of the cell cycle in which DNA is replicated, occurring between G phase and G phase. Precise and accurate DNA replication is necessary to prevent genetic abnormalities which often lead to cell death or disease. Due to the importance, the regulatory pathways that govern this event in eukaryotes are highly conserved. This conservation makes the study of S-phase in model organisms such as Xenopus laevis embryos and budding yeast relevant to higher organisms.
Usage examples of "s phase".
Miss Stricken's phase of the curriculum comes perilously close to being without any real substance.
She would have to make a final check of the hollow around dawn, of course, when the ground should have cooled off enough to permit it -- but her century's phase of the Halpa War did seem to be over.
Petersen's phase modulator hummed, and a long stripe of the stasis field vanished.
So, thanks to Mom's phase theory, I got out of the house with my .