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P21 is a small tetra-peptide derived from the most active region of CNTF (ciliary neurotrophic factor), the amino acid residues 148-151

doi: 10.1134/S1819712408010133

This observation aligns with the findings by Unterman et al

[DOI] [PMC free article] [PubMed] [Google Scholar] 3.Socioeconomic determinants of COVID-19 incidence and mortality in Florida
