The protocol of in vivo experiments and effect of Ang IV on left ventricular function in 5 groups of mice. (A) Animal grouping and timeline of the first part of the in vivo experiment. (B) Animal grouping and timeline of the second part of the in vivo experiment. (C) Representative echocardiographic images in 5 groups of mice. (C1) Two-dimensional echocardiograms showing left ventricular long-axis views, scale bar in mm on the right; (C2) M-mode echocardiograms showing left ventricular dimensions and scale bar in mm on the right, and time stamp in seconds at the bottom; (C3) Pulse-wave Doppler echocardiograms depicting mitral inflow velocities, scale bar in mm/s on the right, and time stamp in seconds at the bottom; (C4) Tissue Doppler echocardiograms displaying mitral annular velocities, scale bar in mm/s on the right, and time stamp in seconds at the bottom. Ang IV: angiotensin IV; AS: FoxO1 inhibitor AS1842856; DM: diabetes mellitus; NC: normal control; STZ: streptozotocin; wks: weeks.