At last, though renewing medium and prolonging the time of culturing, the content of theanine in tea cell was increased to a higher level.
最后通过更新培养基、延长培养时间，使细胞茶氨酸含量得到较大的提高。
2
Stem cell is a class of self-renewing and trap a potential of cell groups, it can self-renewal in long-term and has the ability of differentiation to form variety cells in certain conditions.
We show that endothelial cells interact closely with self-renewing brain tumor cells and secrete factors that maintain these cells in a stem cell-like state.