Another issue which must be faced is that the extreme versatility of embryonic stem cells also makes them less predictable. They cannot always be relied upon to develop as intended and there is a risk of bone developing where muscle is required, or vice versa. The careful selection of adult stem cells which are further along the developmental chain would seem to reduce that risk. Adult stem cells can be harvested without causing harm or loss of life. Provided proper consent is obtained and the stem cells are used for the purpose of developing treatments, there is no ethical problem about their use. Funding should be directed at this area of research.