As model RPs, we used an α‐Galactosidase (αGal) used to treat Fabry's disease (Garman and Garboczi, 2002), the hematopoietic glycohormone erythropoietin (EPO) (Hayat et al., 2008) and the HIV‐neutralizing antibody VRC01 (Wu et al., 2010). The gene discussed is EPO; the disease is Fabry disease.