β-galactosidase expression activated by B6.EIIa-cre in P7 spleen
 A) Spleen from a P7 female, at 2X magnification. |  B) Spleen from a P7 male, at 10X magnification. |
 C) Spleen section from A, at 20X magnification. β-gal expression weak and may not be real. |  D) Spleen section from B, at 20X magnification. β-gal expression here is stronger but variable. |
| Note: Any differences between β-gal expression for the male and female samples are just initial observations. No quantification was conducted to determine if a true sex-based difference is present with the B6.EIIa-cre line. Compare to adult spleen. | |
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