Genetic Collection Protocol is about collecting a sample of blood or spit (saliva) from people who were part of earlier ChiLDReN studies, which looked at liver diseases. These samples will help researchers understand more about these diseases by studying DNA (genetic material). The samples will be stored safely for future research. If you or your child were in studies like PROBE, BASIC, LOGIC, or MITOHEP, you might be eligible. It's a one-time collection and only for those who agreed to give a sample before but hadn't done it yet. The study is for both kids and their biological parents who have not given samples before.

• This study is a one-time visit.
• The samples will be part of future studies to help learn about liver diseases.
• No payment or treatment provided, but it helps important research.

Please Note: Children or parents must still be in contact with the study site. If a child or parent cannot be reached or doesn't meet the criteria, they can't participate. This study is crucial to help scientists understand and find better treatments for liver diseases in the future.