The<unk>  <unk> , also known as amino-terminal collagen crosslinks, is the<unk>  of fibrillar collagens such as collagen type I and type II. It is used as a biomarker to measure the rate of bone turnover.<unk>  can be measured in the urine (uNTX) or serum (serum<unk> .
N-terminal telopeptide
C-terminal telopeptide
Α-Hederin
Fibrin monomer
Progerin
Chaperone 
Fragment crystallizable region
Matrix-core