Figure 1. The effect of rejection upon corneal allografts. A: The rejection kinetics of corneal transplantation in the DA-Lewis combination is shown. Sixteen Lewis rats served as recipients of DA allografts. The opacity grade 3 or 4 is defined as rejection onset. The rejection happened in all allografts from day 11 to day 14 with an MST of 13.1±0.3 days (n=16). Meanwhile, no rejection was observed in any of the isografts (n=6). B: The EC staining in a normal DA cornea is displayed. The cells were distributed regularly, and their nuclei exhibited similar shape (magnification 400X). C: The EC staining in rejected corneal allograft is shown. All ECs were lost except the remaining apoptotic cell (400X).