Comparison of spleen size from adult animals following treatment with TM or control. Genotype and treatment as follows (1, 5) Cre, TM: (2) F/F, TM:(3) F/F, Cre, Control: (4, 10) F/+;Cre, TM:(6, 9) F/F, Cre, TM (two animals in well 6): (7) F/F; Cre, Control and (8) F/+; Cre, Control.