Figure 2 shows the expression levels of mRNA for FBN1, TGFβR1, TGFβR2, and TGFβ2, evaluated in both groups, comparing individuals with Marfan syndrome to the control group. The mRNA levels were compared between controls and Marfan patients, both with and without aortic dilation, aneurysm, or dissection; see Table 6. This evidence concerns the gene TGFBR1 and Marfan syndrome.