Table 2. Genes with significant expression levels in serum-starved nucleus pulposus cells Only genes whose expression was significantly (P<0.05) up- or down-regulated at least 1.5 fold are shown.

GeneSymbol	Description	qRT-PCR		Array
		Fold change	P value	Fold change
Abl1	C-abl oncogene 1, receptor tyrosine kinase	1.78	0.033	1.28
Atm	Ataxia telangiectasia mutated homolog (human)	1.86	0.015	1.43
Brca1	Breast cancer 1	1.57	0.020	1.69
Ccnd1	Cyclin D1	−1.51	0.024	−1.59
Cdc25a	Cell division cycle 25 homolog A (S. pombe)	1.68	0.016	1.31
Gadd45a	Growth arrest and DNA-damage-inducible, alpha	1.82	0.038	1.58
Hus1	HUS1 checkpoint homolog (S. pombe)	1.74	0.042	1.46
Bcl2	B-cell CLL/lymphoma 2	1.89	0.003	1.82
Rad21	RAD21 homolog (S. pombe)	1.62	0.003	1.49
Msh2	MutS homolog 2 (E. coli)	1.63	0.003	1.23
Notch2	Notch homolog 2 (Drosophila)	1.56	0.006	1.38
Ppm1d	Protein phosphatase 1D magnesium-dependent, delta isoform	1.74	0.039	1.39
Rad9	RAD9 homolog (S. pombe)	1.64	0.013	1.37
Stag1	Stromal antigen 1	1.52	0.044	1.52
Terf1	Telomeric repeat binding factor (NIMA-interacting) 1	1.56	0.007	1.24
Tfdp2	Transcription factor Dp-2 (E2F dimerization partner 2)	1.78	0.020	1.39
Tp53	Tumor suppressor protein p53	2.07	0.010	1.403