 Thymopoietin is a protein involved in the induction of CD90 in the thymus.The thymopoetin (TMPO) gene encodes three alternatively spliced mRNAs encoding proteins of 75 kDa (alpha), 51 kDa (beta) and 39 kDa (gamma) which are ubiquitously expressed in all cells.The human TMPO gene maps to chromosome band 12q22 and consists of eight exons.