Natural History Study of ENPP1 Deficiency and the Early-onset Form of ABCC6 Deficiency

Individuals eligible to participate must meet all of the following inclusion criteria:

1. Must provide written consent of the legally authorized representative/caregiver and assent for subjects after the nature of the study has been explained and prior to any research-related procedures, following the policies of the clinical site
2. Genetic confirmation of ENPP1 Deficiency or ABCC6 Deficiency
3. Male or female, aged 2 to <18 years 4. In the opinion of the Investigator, must be willing and able to complete all aspects of the study 5. Agree to provide access to relevant medical records

Individuals who meet the following exclusion criterion will not be eligible to participate:

1. In the opinion of the Investigator and/or Sponsor, presence of any clinically significant disease (outside of those considered associated with the diagnosis of ENPP1 Deficiency or the early-onset form of ABCC6 Deficiency) that precludes study participation or may confound interpretation of study results, such as an unrelated bone, mineral, or muscle disease or genetic connective tissue disease