Averaged and fitted pressure-force data taken from the ascending aortas of Tgfb1+/−, Tgfb2+/−, Tgfb3+/−, wild-type (WT), and elastase infused wild-type (Elastase) mice. Experimental data are shown as discrete values ± the standard error of the mean at low (blue circle), medium (red square), and high (yellow triangle) axial stretch ratios. The medium condition represents the force-invariant pressurization axial stretch ratio. Fitted results using the 4-fiber-family Holzapfel-Gasser-Ogden (HGO) model are represented by curves (black). The elastase sample (green diamond) was tested at a single axial stretch ratio.