S phase

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noun Cell Biology.

the period of the cell cycle prior to mitosis, during which the chromosomes are replicated.

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IS and ARE are both forms of which verb?

Origin of S phase

First recorded in 1940–45

The next phase of the trial consists of vaccinating Ebola workers on the front lines.
The Race for the Ebola Vaccine|Abby Haglage|January 7, 2015|DAILY BEAST
“A guy drives up in a 2008 Mercedes, brand new,” Harry S. Connelly Jr. says in the video, according to the Times.
Are Police Stealing People’s Property?|Joan Blades, Matt Kibbe|January 2, 2015|DAILY BEAST
“Personal hotspots can get speeds of up to 60 Mb/s down, whereas hotel Wi-Fi can be as slow as 1.5 Mb/s,” Sesar said.
How ‘Ethical’ Hotel Chain Marriott Gouges Guests in the Name of Wi-Fi Security|Kyle Chayka|December 31, 2014|DAILY BEAST
In our headlong quest for a legally perfect society, we don’t take the time to take stock of what‘s been created so far.
Red Tape Is Strangling Good Samaritans|Philip K. Howard|December 27, 2014|DAILY BEAST

The families announced along with it that they had entered a “phase of silence” surrounding the details of the new deal.
A Sunni-Shia Love Story Imperiled by al Qaeda|Ruth Michaelson|December 26, 2014|DAILY BEAST
But between the phase of schooling and the phase of adult learning there is an intermediate stage.
The Salvaging Of Civilisation|H. G. (Herbert George) Wells
Ajoutez cecy, s'il vous plaist, la grande difficult qu'il y a de tirer d'eux les mots mesmes qu'ils ont.
The Jesuit Relations and Allied Documents, Vol. II: Acadia, 1612-1614|Various
Neantmoins le vieil Membertou, pere du malade, conceut asss l'affaire, et me promit qu'on s'arresteroit tout ce que j'en dirois.
The Jesuit Relations and Allied Documents, Vol. II: Acadia, 1612-1614|Various
En effet un soir, sa femme et enfans l'abandonnerent entierement, et s'en allerent cabaner ailleurs, pensant que c'en estoit vuid.
The Jesuit Relations and Allied Documents, Vol. II: Acadia, 1612-1614|Various
Mrs. S. said she was familiar with it from having heard Thomas's orchestra play it in New York.
Music-Study in Germany|Amy Fay

S phase

The phase of the mitotic cycle during which DNA synthesis occurs.