A mutant cell bank in support of research in aging has been established at the Institute for Medical Research, Camden, N.J. The bank is under contract support of the Adult Development and Aging Program of the National Institute of Child Health and Human Development. We anticipate that the bank, with associated services such as an annual workshop, will facilitate the growth of the NIH grant-supported cellular aging research program and thus contribute to the elucidation of mechanisms in human aging at the cellular and molecular level.