Table 3.

Principal Component Analysis conducted on liver protein expression

Variables	PC1	PC2
	Calcium metabolism and ageing	Cell growth and biogenesis
Regucalcin (spot N°748)	0.86
Fructose-1,6-biphosphatase 1 (spot N°516)	0.82
Indolethylamine N-methyltransferase (spot N°657)	0.74
Glycine N-methytransferase and/or Malate dehydrogenase 1 (spot N°570)		0.93
Alpha-enolase and/or Adenosylhomocysteinase (spot N°422)		0.89
Selenium-binding protein 1 (spot N°383)		-0.72
Eigenvalues	2.77	1.86
% of variance	46.2	31.1

Principal Component Analysis was run from liver protein expression data of 12 reproductive adult females after litter size manipulation. Spot N° correspond to those reported in Additional file 1: Figure S1.