Total RNA was extracted using Trizol® Reagent (Invitrogen). RT-PCR was performed as described previously [7 (link)] using a reaction kit containing M-MLV reverse transcriptase (Roche) and ProTaq® DNA polymerase (Roche).The primers used for c-Maf, CCND2, ITGB7 and GAPDH were described previously [7 (link)]. The thermal cycle conditions used were as follows: 1 cycle at 94 °C for 5 min; 35 cycles at 94 °C for 30 s; 55 °C for 30 s; 72 °C for 30 s; and 1 cycle at 72 °C for 10 min.
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