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Modified serum transferrin glycosylation pattern determined by isoelectric focusing (IEF) suggested the diagnosis of congenital disorders of glycosylation type I (CDG I) in the patient. Isoelectric focusing of transferrin (Tf) from the patient and negative control with marked individual sialylated protein bands. In the patient's sample, increased disialo‐ and asialo‐Tf along with mildly decreased levels of tetra‐ and pentasialo‐Tf are consistent with CDG I profile
