PTPRC and Alzheimer disease: The expression of haematopoietic cell markers was low: CD45 (1.45% ± 0.60) and CD34 (1.53% ± 0.39) in BM-MSCs and CD45 (1.54% ± 0.46) and CD34 (0.88% ± 0.30) in AD-MSCs.