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On of b-actin, a relatively invariant internal reference RNA, was performed in parallel, and cDNA amounts were standardized to equivalent b-actin mRNA levels. These primer sets specifically recognize only the genes of interest asFor experiments, cells were made quiescent at confluence by incubation in serum-free DMEM/F-12 for 24 h. Growth-arrested RBA-1 were incubated with LTA at 37 for various t