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A 2-day-old baby boy was noted to be jaundiced (yellowing of skin and eyes). His initial bilirubin was 25 mg/dL (normal range is 2–10 mg/dL). By day 5 of age, bilirubin levels began falling and continued to fall over the subsequent few days. There was an associated fall in hemoglobin to a minimum and the reticulocyte count was raised at 20%. A glucosо-6-phosphate dehydrogenase assay was performed and confirmed erythrocytic glucosо-6-phosphate dehydrogenase deficiency. Which of the following pathways is stopped in such disease?