The cover photo shows fluorescence in situ hybridization analysis of a microchimeric fetal cell in a liver tissue specimen from a woman with autoimmune hepatitis. The male fetal cell has one X chromosome signal (red) and one Y chromosome signal (green). The neighboring female (maternal) cells have two X chromosome signals each (not all X chromosome signals in the female cells are visible in the plane of focus of this image). Nuclei are stained blue with the DNA-specific dye 4,6-diamidino-2-phenylindole (DAPI).
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