"Some childhood vaccines, including the one against rubella -- which is part of the MMR vaccine given to millions of children worldwide for measles, mumps and rubella -- is cultured in "WI-38 human diploid lung fibroblasts," according to the U.S. Food and Drug Administration's fact sheet on the vaccine's ingredients. Merck, the vaccine's manufacturer, acknowledged that those cells were originally obtained from an electively aborted fetus. They were used to start a cell line, which is a cell multiplied over and over again to produce cells that are of a consistent genetic makeup. The WI-38 cell line is used as a culture to grow live viruses that are used in vaccines."