Description
Angiotensin I (AT I) is a peptide cleavage product of angiotensin and serves no primary biological purpose other than to function as a precursor to angiotensin II.
References
Gonzalez-Villalobos RA, Shen XZ, Bernstein EA, et al. Rediscovering ACE: novel insights into the many roles of the angiotensin-converting enzyme. J Mol Med (Berl). 2013 Oct;91(10):1143-54. PMID: 23686164.