β-galactosidase expression activated by B6.EIIa-cre in P7 heart
 A) P7 female heart at 2X magnification. |  B) P7 male heart at 2X magnification. |
 C) The same section from A, at 20X magnification. β-gal expression does not appear specific to any cell type. |  D) The same section from B, at 20X magnification. β-gal expression does not appear specific to any cell type. |
| 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 heart. | |
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