Question

although about 90% of the protein found in bone is ____, other proteins, such as ____, are also important.
keratin; osteocalcin
collagen; keratin
collagen; osteocalcin
osteocalcin; keratin
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Explanation:

Collagen makes up about 90% of the protein in bone. Osteocalcin is another important bone - related protein. Keratin is mainly found in hair, nails, and the outer layer of skin, not a major bone protein.

Answer:

collagen; osteocalcin