Table 1  Experimental groups used for gene expression profiling
Group  Treatment  RNA source  No. of mice  CV (percentage)
DBA/1_NC  None  LN from naive control DBA/1  3  22.8
DBA/1_PI  CFA + collagen II  LN from DBA/1 at day 10 after immunisation  3  20.4
DBA/1_OA  CFA + collagen II  LN from DBA/1 mice at day 35 after immunisation  3  21.7
DBA/1_CA  CFA + collagen II  LN from DBA/1 mice at day 95 after immunisation  3  25.8
FVB/N_NC  None  LN from naive control FVB/N  3  21.1
FVB/N_PI  CFA + collagen II  LN from FVB/N at day 10 after immunisation  3  22.6
FVB/N_OA  CFA + collagen II  LN from FVB/N mice at day 35 after immunisation  3  18.4
FVB/N_CA  CFA + collagen II  LN from FVB/N mice at day 95 after immunisation  3  21.1
CA, chronic arthritis; CFA; complete Freund's adjuvant; CV, coefficient of variation; LN, lymph node; NC, naive control; OA, onset of arthritis; PI, post-immunisation.