Prothymosin α is a nuclear protein

Abstract
Prothymosin α, a protein first isolated from rat thymus and widely distributed in animal tissues, has an attributed role in the stimulation of the immune system. Its structure contains thymosin α1, a Glu‐rich domain and a putative nuclear location signal. Furthermore, the amount of this protein seems to be associated with the relative size of the nucleus and is inducible during cell growth. We postulate that prothymosin α is located inside the cell nucleus and that its activity might be to organize some protein complexes.