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Claudin 5 expression in ETV5 knockout mice. Claudin 5 immunostain (green) is detectable in the rete testes epithelium of ETV5 knockout mice but is not detectable in the seminiferous epithelium (lower right). Claudin 5 is also expressed in testicular vascular endothelium (not shown). Reprinted from Morrow et al. (2009). Scale bar, 50 µm.
