Stem Cells Cultivated Free of Animal Contaminants

qewl writes "In a follow-up to this story, researchers at Massachusetts-based Advanced Cell Technology have created a new method of growing human embryonic stem cells that has overcome the major obstacle of animal contaminants to their use for human treatments. As President George W Bush has restricted federal funding of this research to limited cell lines existing since 2001, scientists have strived to find ways to keep the lines pure. Irina Klimanskaya and colleagues at ACT grew the stem cells from the beginning on a cell and serum-free mixture called an extracellular matrix. "The importance of this work, of course, is that by eliminating contact with animal and human cells, you minimize the risk of contamination with pathogens that could be transmitted to patients and the population at large," Dr. Lanza at ATC said."