12-month-old boy is brought to the emergency room for examination of his right arm following a tumble at home. Radiologic examination of the limb reveals a recent fracture of the right ulna and evidence of additional healing fractures. The child is noted to have blue sclerae. This patient most likely carries a mutation in a gene that encodes which of the following proteins?

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Vikas Bhardwaj
Medical Technologist, AIIMS New Delhi
Updated: Apr 17, 2026