Abstract: Provided are a cardiomyocyte preparation, a preparation method therefor and the use of the preparation in treating heart failure. The cardiomyocyte preparation comprises cardiomyocytes and fibroblasts, differentiated from pluripotent stem cells, wherein the concentration of the cardiomyocytes in the cardiomyocyte preparation is 0.75×107-1.0×109 cells/mL, and the content of the cardiomyocytes is higher than 80% while the content of the fibroblasts is not higher than 20%. The cardiomyocyte preparation can improve cardiac ejection fraction and left ventricular fractional shortening, and increase the thickness of the left ventricular inner wall.

Abstract: Disclosed are a medium for differentiating neural stem cells into oligodendrocyte precursors and a method for preparing oligodendrocyte precursors by using the medium. The medium does not contain exogenous factors, and can avoid the contamination of exogenous factors and differentiate oligodendrocyte precursors.

Abstract: Provided are a cardiomyocyte preparation, a preparation method therefor and the use of the preparation in treating heart failure. The cardiomyocyte preparation comprises cardiomyocytes and fibroblasts, differentiated from pluripotent stem cells, wherein the concentration of the cardiomyocytes in the cardiomyocyte preparation is 0.75×107-1.0×109 cells/mL, and the content of the cardiomyocytes is higher than 80% while the content of the fibroblasts is not higher than 20%. The cardiomyocyte preparation can improve cardiac ejection fraction and left ventricular fractional shortening, and increase the thickness of the left ventricular inner wall.

Abstract: A method of extracting neural stem cells from a living subject, comprising the steps of introducing magnetic nanoparticles into the subject, targeting the neural stem cells with the magnetic nanoparticles to form magnetic nanoparticle-targeted cells, isolating the magnetic nanoparticle-targeted cells, extracting the magnetic nanoparticles-targeted cells from the subject.