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Background: CD90 (Cluster of Differentiation 90, Thy-1) is a heavily N-glycosylated GPI linked cell surface protein member of the immunoglobulin (Ig) superfamily. As a smallest member of family, CD90 may play a role in cell-to-cell and cell-to-ligand interactions during synaptogensis and other neuron related activities (e.g. neurite outgrowth, nerve regeneration) (1). In developing nervous tissue, CD90 is involved in axon growth regulation by halting axon growth in mature axon via its interaction with intergin-beta-3 on mature astrocytes. Additionally, CD90 has been linked to apoptosis, adhesion, migration, cancer (including cancer stem cells), and fibrosis (2). As a major marker for hematopoietic stem cells (HSCs), CD90 mediates differentiation of HSCs. In stem cancer cell research, CD90 positive cells in the hepatocellular carcinoma (HCC) have been shown to display tumorigenic capacity (3).