If X is the number of cells, then the rate of change of X, dX/dt, the rate of change of the cell population, how fast division is taking is proportional to the number of cells I have.

如果X是细胞数目,那么X的改变率就是dX/dt,就是细胞数目的改变率,分裂的速度有多快,和细胞数量呈比例关系

耶鲁公开课 - 生物医学工程探索课程节选

In the mosaic form, only some of the body's cells have the third X chromosome.

CNN: Triple X syndrome

Because only some cells contain the extra X chromosome, females with the mosaic form of triple X syndrome may have less severe symptoms.

CNN: Triple X syndrome

In Syndrome X, the body overproduces insulin because the cells refuse to listen to its instructions.

FORBES: The Unknown Epidemic