"3 consanguineous siblings with syndromic congenital myelofibrosis had a variant (NM_022340.3:c.289G>C; NP_001289307.1:p.Gly97Arg) in RBSN. All 3 were homozygous; the parents and a cousin were heterozygous. RBSN loss of function causes a severe syndromic form of congenital myelofibrosis confirming that rabenosyn-5 plays a vital role in human development and hematopoiesis."xsd:string