THY1 and glomerulonephritis: Ito et al. (2001) introduced green fluorescent protein (GFP)-labeled mouse BMSCs into wild-type mice with anti-Thy1 glomerulonephritis via intravenous injection and found that 7–8% of the mesangial cells in reconstructed globules were GFP-positive, CD45-negative, and Thy1-positive, thereby confirming that MSCs can differentiate into mesangial cells in vivo.