Short protein of 49 amino acid isolated from bovine spleen cells [1]. Thymopoietins (TMPOs) are a group of ubiquitously expressed nuclear proteins. They are suggested to play an important role in nuclear envelope organisation and cell cycle control [2].

1: Complete amino acid sequences of bovine thymopoietins I, II, and III: closely homologous polypeptides. Audhya T, Schlesinger DH, Goldstein G; Biochemistry 1981;20:6195-6200. PMID:7306506

2: On the role of thymopoietins in cell proliferation. Immunochemical evidence for new members of the human thymopoietin family. Weber PJ, Eckhard CP, Gonser S, Otto H, Folkers G, Beck-Sickinger AG; Biol Chem 1999;380:653-660. PMID:10430029