A Clinical Assessment Study of Subjects With Mucopolysaccharidosis IVA (Morquio Syndrome)

Inclusion Criteria: * Willing and able to provide written, signed informed consent, or in the case of subjects age \< 18 years, provide written assent (if required) and written informed consent by a legally authorized representative after the nature of the study has been explained, and prior to any research-related procedures. * Documented history of reduced GALNS activity relative to the normal range of the laboratory performing the assay, or documented result of molecular genetic testing confirming diagnosis of MPS IVA. * Willing and able to comply with all study procedures. Exclusion Criteria: * Use of any investigational product or investigational medical device within 30 days prior to screening. * Previous hematopoietic stem cell transplant (HSCT). * Concurrent disease or condition that would interfere with study participation or pose a safety concern.