Assertion: alpha thalassemia | /r/CreatedBy | deletion
Facets:
value: by point mutations
type: OTHER
value: usually
type: DEGREE
Source sentences:
text: Is alpha thalassemia usually caused by deletions or by point mutations?
text: Alpha-thalassemia is caused by deletions or mutations in the HBA1and/or HBA2 genes, meaning pieces of the gene are missing or changed.