This family of proteins is found exclusively in humans. Humanin is a short anti-apoptotic peptide that interacts with Bax [4].

1: Solution structure of humanin, a peptide against Alzheimer's disease-related neurotoxicity. Benaki D, Zikos C, Evangelou A, Livaniou E, Vlassi M, Mikros E, Pelecanou M; Biochem Biophys Res Commun. 2005;329:152-160. PMID:15721287

2: Evidence for potential functionality of nuclearly-encoded humanin isoforms. Bodzioch M, Lapicka-Bodzioch K, Zapala B, Kamysz W, Kiec-Wilk B, Dembinska-Kiec A; Genomics. 2009;94:247-256. PMID:19477263

3: High-dose methotrexate in children with acute lymphoblastic leukemia: 7-hydroxymethotrexate systemic exposure and urinary concentrations at the steady state correlate well with those of methotrexate. Chladkova J, Hak J, Martinkova J, Chladek J; Arzneimittelforschung. 2010;60:769-775. PMID:21265469

4: Humanin peptide suppresses apoptosis by interfering with Bax activation. Guo B, Zhai D, Cabezas E, Welsh K, Nouraini S, Satterthwait AC, Reed JC; Nature. 2003;423:456-461. PMID:12732850