Table 2. Housekeeping proteins monitored to demonstrate equal loading of the gel and consistent responses in the LC-tandem MS analysis.

	Gene name	Protein name	Molecular weight (kDa)	Function
1	Calr	calreticulin	53	endoplasmic reticulum calcium binding protein
2	Gapdh	glyceraldehyde-3-phosphate dehydrogenase	36	cytosolic enzyme in carbohydrate metabolism
3	Hspd1	60 kDa heat shock protein, mitochondrial	58	mitochondrial chaperonin
4	Ldha	lactate dehydrogenase A	36	cytoplasmic enzyme in anaerobic glycolysis
5	Lyz	chicken lysozyme	16	non-endogenous internal standard
6	Ncl	nucleolin	76	nuclear RNA and DNA binding protein
7	Rps8	40S ribosomal protein S8	24	structural constituent of the ribosome