The following search terms were used in all four databases: “hemopexin AND (sickle cell disease),” “hemopexin AND (sickle cell anemia),” “haemopexin AND (sickle cell disease),” “(beta-1B-glycoprotein) AND (sickle cell disease),” and “(beta-1B-glycoprotein) AND (sickle cell anemia).” Additionally, abbreviations were used in place of sickle cell disease (SCD) and hemopexin (Hpx) to perform a more comprehensive search. Here, HPX is linked to Schnyder corneal dystrophy.