Pro-Hyp	prolyl-hydoxyproline
Hyp-Gly	hydroxyprolyl-glycine
Ala-Hyp	alanyl-hydroxyproline
Ile-Hyp	isoleucyl-hydroxyproline
Leu-Hyp	leucyl-hydroxyproline
Phe-Hyp	phenylalanyl-hydroxyproline
Glu-Hyp	glutamyl-hydroxyproline
Pro-Hyp-Gly	prolyl-hydroxyprolyl-glycine
Gly-Pro-Hyp	glycyl-prolyl-hydroxyproline
Ala-Hyp-Gly	alanyl-hydroxyprolyl-glycine
Ser-Hyp-Gly	serinyl-hydroxyprolyl-glycine
FBS	fetal bovine serum
LMW	low molecular weight
ABS	adult bovine serum
SEC	size-exclusion chromatography
HPLC	high performance liquid chromatography
EDTA	ethylenediaminetetraacetic acid
DMEM	Dulbecco’s Modified Eagle Medium
D-PBS	Dulbecco’s phosphate-buffered saline
AccQ	6-Aminoquinolyl-N-hydroxy succinimidyl carbamate
LC-MS/MS	liquid chromatography tandem mass spectrometry
MRM	multiple reaction monitoring