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Feather patterning.
Detection of beta-catenin expression (purple) allows visualization of down feather primordia interspersed among the elongating tract feathers on a 13-day duck embryo. Mou et al. show that the mechanism for defining feather spacing is locally modulated in different regions of the skin during feather patterning, making certain areas—particularly the neck—particularly prone to loss of feather coverage.
Image Credit: Denis Headon
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