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Card 12 / 27:
Considering how a long bone develops, what are the similarities and differences between a primary and a secondary ossification center?
A single primary ossification center is present, during endochondral ossification, deep in the periosteal collar. Like the primary ossification center, secondary ossification centers are present during endochondral ossification, but they form later, and there are two of them, one in each epiphysis.
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