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Due to the presence and activity of mammary stem cells (MaSC), growth and remodelling of mammary gland during puberty and lactation cycles is possible. In this study the number of putative mammary stem/progenitor cells was examined in 20 months old non-pregnant Holstein-Friesian heifers. Cells were double-stained with fluorescent dye-conjugated antibodies against stem cell antigen-1 (Sca-1) and fibronectin...
Experiments were performed on 180 mice from two lines dubbed light (L) and heavy (C), selected divergently for body weight over 108 generations. The main hypothesis was that the changes occurring in body weight and muscle weight as a result of directed divergent selection could be associated with changes in the transcription of some miogenic genes and/or with the level of proteins regulating myogenesis...
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