hosts 13 of the 21 stem cell lines that exist in the world and are listed on the Stem Cell Registry hosted by the National Institutes of Health. In 1987, the World Health Organization established a reference cell bank to provide a resource for the development of vaccines and other biological medicines. Another reference cell bank was established by the World Health Organization in 2007 as a result of stability issues with MRC-5 cells. See also Tissue bank References Stem cells Biological engineering