To verify the expression of Mb, total RNA extracts from PAM-MSCs and MAT-MSCs were subjected to q-RT-PCR amplifying two alternative transcripts of the human Mb gene [17]: the variant 2 (NM_005368) expressed in muscle and hearth tissue and the variant 13 (NM_203377) expressed in hematopoietic stem/progenitor cells (HSPCs) and epithelial cancer cells (Fig. 1A) [3, 6, 18]. Here, MB is linked to cancer.