HeLa cells have gone to the moon to test the effect of zero gravity.

VOA: special.2010.07.21

For the first time, scientists around the world had a limitless number of cells they could use to test the effects of diseases, medicines and chemicals.

VOA: special.2010.07.21

Jonas Salk used these HeLa cells to test the first vaccine for polio.

VOA: special.2010.07.21

A Pap test looks for abnormal cervical cells that could become cancer.

VOA: special.2009.11.25