Objective To investigate the gene expression profile during the replicative senescence of human embryonic lung diploid fibroblasts(2BS) and try to screen for characteristic genes for senescence evaluation.Methods Comparison of gene expression profile between PD28 and PD64 2BS cells was performed by cDNA microarrays.The expression intensity of 9 selected genes in 2BS cells at 7 different population doubling levels was verified by RT-PCR.Results As demonstrated by microarray analysis,expression of 117 genes w...