The protein expression of ex vivo99mTc-UCMSC-EVs in liver tissues was measured quantitatively. A Western blot analysis was conducted to identify exosome marker proteins in both the 99mTc-UCMSC-EVs-treated group and the untreated control group. The results showed a significant increase in the expression levels of CD63 in 99mTc-UCMSC-EVs (fold increase to control with beta-actin normalized, 2.11 ± 0.63, n = 3, ∗) compared to the control (1 ± 0.30, n = 3). ∗, p < 0.05.