Sable · Question
What is the difference between Thymosin alpha-1 and P21?
Thymosin alpha-1 is a 28-residue N-acetylated peptide originally isolated from thymus tissue (thymosin fraction 5), studied in immunology research (peptide, MW about 3108.3 g/mol).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between Thymosin alpha-1 and P21?
Thymosin alpha-1 is a 28-residue N-acetylated peptide originally isolated from thymus tissue (thymosin fraction 5), studied in immunology research (peptide, MW about 3108.3 g/mol).
Which is heavier, Thymosin alpha-1 or P21?
Thymosin alpha-1 has a molecular weight of about 3108.3 g/mol and P21 about 578.7 g/mol (PubChem), so Thymosin alpha-1 is heavier by 2,529.6 g/mol, a ratio of 5.37. This means 1 mg of Thymosin alpha-1 contains 321.7 nmol versus 1,728 nmol for P21.
How many mg of P21 are equimolar to 1 mg of Thymosin alpha-1?
1 mg of Thymosin alpha-1 (MW 3108.3) is 321.7 nmol. The same number of moles of P21 (MW 578.7) weighs 0.1862 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of Thymosin alpha-1 and P21
PubChem lists Thymosin alpha-1 as C129H215N33O55 (3108.3 g/mol) and P21 as C27H42N6O8 (578.7 g/mol). Thymosin alpha-1 is a peptide; P21 is a peptidomimetic. These formulas refer to the parent compounds without salt counter-ions.
A 10 mg vial of P21 equals how many mg of Thymosin alpha-1 in moles?
10 mg of P21 (MW 578.7) is 17.28 µmol. The same amount of Thymosin alpha-1 (MW 3108.3) would weigh 53.712 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of P21 equals how many mg of Thymosin alpha-1 in moles?
5 mg of P21 (MW 578.7) is 8.64 µmol. The same amount of Thymosin alpha-1 (MW 3108.3) would weigh 26.856 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of Thymosin alpha-1 equals how many mg of P21 in moles?
5 mg of Thymosin alpha-1 (MW 3108.3) is 1.609 µmol. The same amount of P21 (MW 578.7) would weigh 0.9309 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of Thymosin alpha-1 equals how many mg of P21 in moles?
10 mg of Thymosin alpha-1 (MW 3108.3) is 3.217 µmol. The same amount of P21 (MW 578.7) would weigh 1.862 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
More questions about thymosin-alpha-1
A CoA for every lot; each vial carries a printed lot number that matches it. Ask with the lot number and we send it.
Cite this
Research use only. Not for consumption. No health claims.
Plain
Sable Peptides. (2026). What is the difference between Thymosin alpha-1 and P21?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/p21-vs-thymosin-alpha-1/#sqa-041024
APA
Sable Peptides. (2026, October 11). *What is the difference between Thymosin alpha-1 and P21?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/p21-vs-thymosin-alpha-1/#sqa-041024
BibTeX
@misc{sable_#sqa-041024_2026,
author = {{Sable Peptides}},
title = {{What is the difference between Thymosin alpha-1 and P21?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/p21-vs-thymosin-alpha-1/#sqa-041024}},
note = {Accessed 11 October 2026. CC BY 4.0}
}Badge
<a href="https://www.sablepeptides.co.uk/ref"><img src="https://www.sablepeptides.co.uk/badge/ref.svg" alt="Data: UK Research Peptide Reference — Sable Peptides" width="220" height="40"></a>
Date modified: 2026-10-10