Fig. 2. Ultrasound time–intensity curves (TIC) from myocardial contrast echocardiography of allografts and isografts imaged with functionalized and non-functionalized nanobubbles. (A, C, and E) show TIC for isografts at 2, 4, and 6 days post transplantation, respectively. (B, D, and F) show TIC for allografts at 2, 4, and 6 days post transplantation, respectively. Note the delayed intensity peak in for allografts imaged with functionalized nanobubbles.⁴⁷.