Nuveen Lifecycle Index 2055 R6 (TIAA-CREF Lifecycle Index Fd 20) Fonds

The fund is a "fund of funds" that invests in Class W shares of other funds of the Trust and potentially in other investment pools or investment products. It has a policy of investing at least 80% of its assets (net assets, plus the amount of any borrowings for investment purposes) in underlying funds that are managed to seek investment returns that track particular market indices.