Figure 2. Spermatozoa with different TUNEL labeling levels (100X).   A. TUNEL-negative spermatozoa with 0% fluorescence under white light. A.1. The same spermatozoa under UV light. B. Negative spermatozoa with <50% fluorescence under white light. B.1: The same spermatozoa under UV light. C. Positive spermatozoa with >50% fluorescence under white light. C.1. The same spermatozoa under UV light.