"The Ret stains the spermatagonial stem cells very specifically, which is exactly what we need."

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Image: Western blot analysis of Ret protein levels in protein lysates from SNpc (top) and striatum (bottom) of 3-mo-old control (Retlx/+and DAT-Retlx/+) and DAT-Retlx/lx mutant mice. Immunoblots were reprobed with anti–α-tubulin antibodies as loading controls.