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This study by CD Treiber et al. published in Nature explores the number and distribution of PB-positive cells in the upper beak epithelium of birds, shedding light on avian biology. The research, conducted in 2012, presents valuable insights into the molecular composition of avian beaks.
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Number and distribution of PB-positive cells in the upper beak. CD Treiber et al. Nature000, 1-4 (2012) doi:10.1038/nature11046