TABLE 1.

Effects of LTR deletions upon lymphomagenicity of MCF13 MLV

Virus	No. of mice inoculated	Disease incidence (%)a	Avg latency ± SEM (days)b
WT	29	93.1	102 ± 4.1
ΔNF-κB	17	82.4	131 ± 6.5c
ΔDEN	26	23.1	147 ± 8.8c

^aPercentage of inoculated animals that developed thymic lymphoma. 

^bCalculated from animals with thymic lymphoma that were sacrificed or found dead. 

^cSignificantly different from the average latency of WT virus as determined by the Student’s t test (P < 0.01).