MS	mass spectrometry
MALDI-ToF-MS	matrix assisted laser desorption/ionization - time of flight - mass spectrometry
SRM	selected reaction monitoring
LAPs	low abundant proteins
mAbs	monoclonal antibodies
SELEX	Systematic Evolution of Ligands by EXponential enrichment
SBA	SMAD-binding element
LOD	limit of detection
LOB	limit of blank
SD	standard deviation
BCA	bicinchoninic acid
RT	room temperature
FASP	filter aided sample preparation