1. They don't expire - there is not any evidence of detrimental deterioration 2. No - it's a different type of stem cell. The stem cells from cord blood are muc

1. They don't expire - there is not any evidence of detrimental deterioration 2. No - it's a different type of stem cell. The stem cells from cord blood are much more stable. Others have a risk of being carcinogenic even! ie embryonic stem cells