: a crystalline nonessential amino acid C3H7NO3 that occurs as a residue in many proteins
Examples of serine in a Sentence
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Spot On! Advertisement Advertisement There are also 11 non-essential amino acids—alanine, arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, proline, serine, and tyrosine—that can be produced by your body.
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Stacey Colino, Time, 27 May 2025
But their relative levels remained consistent before and after the chunks were plunged into the asteroid simulation—there was always more glycine than serine, and more serine than alanine.
—WIRED, 31 Jan. 2023
Many types of cancer cells grew more slowly when deprived of two related amino acids, serine and glycine, and deleting p53 ramped up that effect.
—Jocelyn Kaiser, Science | AAAS, 1 Apr. 2021
The amount of glycine and serine, for example, both doubled.
—WIRED, 31 Jan. 2023
Hyaluronidases and serine proteases aid in the efforts, and the helpless tissue succumbs to the venom's siege.
—Christie Wilcox, Discover Magazine, 19 Apr. 2016
Repeats with a lot of proline, threonine and serine transform a typical protein to a mucin because of the polypeptide structure that is formed.
—Coren Walters-Stewart, Discover Magazine, 18 Oct. 2022
This compound was the first ingredient of the pheromone cocktail discovered: a chemical called N-3-methylbutanoyl-O-methylpropanoyl-L-serine methyl ester, or MB-MP-S.
—Lesley Evans Ogden, Discover Magazine, 19 Aug. 2019
Looking at the ingredient list, serine and biotin appear towards the beginning, meaning the formula has it in higher concentrations.
—Jihan Forbes, Allure, 31 Jan. 2022
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Stacey Colino, Time, 27 May 2025
But their relative levels remained consistent before and after the chunks were plunged into the asteroid simulation—there was always more glycine than serine, and more serine than alanine.
—WIRED, 31 Jan. 2023
Many types of cancer cells grew more slowly when deprived of two related amino acids, serine and glycine, and deleting p53 ramped up that effect.
—Jocelyn Kaiser, Science | AAAS, 1 Apr. 2021
The amount of glycine and serine, for example, both doubled.
—WIRED, 31 Jan. 2023
Hyaluronidases and serine proteases aid in the efforts, and the helpless tissue succumbs to the venom's siege.
—Christie Wilcox, Discover Magazine, 19 Apr. 2016
Repeats with a lot of proline, threonine and serine transform a typical protein to a mucin because of the polypeptide structure that is formed.
—Coren Walters-Stewart, Discover Magazine, 18 Oct. 2022
This compound was the first ingredient of the pheromone cocktail discovered: a chemical called N-3-methylbutanoyl-O-methylpropanoyl-L-serine methyl ester, or MB-MP-S.
—Lesley Evans Ogden, Discover Magazine, 19 Aug. 2019
Looking at the ingredient list, serine and biotin appear towards the beginning, meaning the formula has it in higher concentrations.
—Jihan Forbes, Allure, 31 Jan. 2022
Cite this Entry
“Serine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/serine. Accessed 5 Jul. 2025.
Copy CitationMedical Definition
serine
noun
ser·ine
ˈse(ə)r-ˌēn 
: a nonessential amino acid C3H7NO3 that occurs especially as a structural part of many proteins and phosphatidylethanolamines and is a precursor of glycine
—abbreviation Ser
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