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Each 1 mL of solution contains 10 mg of burosumab.
Burosumab is a human immunoglobulin G subclass 1 (IgG1), anti-human fibroblast growth factor 23 (FGF23) antibody produced by recombinant DNA technology using Chinese hamster ovary cells. Burosumab is composed of two heavy chain (γ1-chain) molecules and two light chain (κ-chain) molecules. Each heavy chain has an N-linked carbohydrate moiety at asparagine 297 (Asn297). The molecular weight of burosumab determined by mass spectrometry is approximately 147,000.
Excipients/Inactive Ingredients: Each 1 mL of solution contains L-histidine (1.55 mg), L-methionine (1.49 mg), polysorbate 80 (0.5 mg), D-sorbitol (45.91 mg) in Water for Injection, USP. Hydrochloric acid may be used to adjust to a pH of 6.25.
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