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S phase

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noun Cell Biology.
  1. the period of the cell cycle prior to mitosis, during which the chromosomes are replicated.
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Origin of S phase

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
s phase in Medicine

S phase

n.
  1. The phase of the mitotic cycle during which DNA synthesis occurs.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.