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Intact and carboxy-terminal fibroblast growth factor-23 (FGF-23) levels in plasma versus serum. Plasma and serum from the same individuals (n = 20) were evaluated for intact (upper panel) and carboxy-terminal (lower panel) FGF-23 as described in Materials and Methods. Some values for serum for the intact FGF-23 were undetectable. C-terminal, carboxy-terminal.
