What is stem cells 

Stem cells (SC) are a type of cells that have the renewing ability (self-renewing) and the potential of multi-differentiation. Under certain conditions, Stem cells  can differentiate into a variety of functional cells. Stem cells are divided into embryonic stem cells (ES cells) and adult stem cells (somatic stem cells) according to their developmental stage. Stem cells can be divided into three types according to their developmental potential: totipotent stem cells (TSC), pluripotent stem cells (pluripotent stem cells) and unipotent stem cells (unipotent stem cells). 

Quality control of stem cell  technology 

Stem cell products have the characteristics of diversity, variability, complexity and so on. Quality control should select representative production batches and appropriate production stage samples (including cell banks etc.) for study. The content of quality control should cover cell characteristic analysis, physicochemical characteristic analysis, purity analysis, safety analysis and effectiveness analysis as much as possible.