Figure 5.

Reduction of the numbers of apoptotic thymocytes by expression of the NP34 transgene. Sections were prepared from F5⁺Rag-1^−/−Tap-1⁺NP34⁺, positively selecting F5⁺Rag-1^−/−Tap-1⁺, nonselecting F5⁺Rag-1^−/−Tap-1^−/−, and negatively selecting F5⁺Rag-1^−/−Tap-1⁺I-E⁺ thymuses and stained using the TUNEL assay. Bars represent mean values of the number of apoptotic cells per cm² as examined with a ×40 objective in thymuses of three to four mice of each genotype. SDs are indicated.