COL1A2 and lentivirus infection: TGFβ1-induced COL1A2, PAI-1, and CTGF mRNA levels were also partially inhibited by shSET7/9 lentivirus infection (Additional file 1: Figure S3D), whereas no significant increase and decrease induced by TGFβ1 and shSET7/9, respectively, was observed in the GCD2-homozygous cells (Additional file 1: Figure S3D).