Building off previous work, we decided to look in more detail at these foramina, on the bony surface of the roof of the mouth, which have been proposed as proxies for baleen. For a review of the hypotheses, see @CMPeredo et al. (2017) in @FrontiersIn: http
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“We suggest that the origin of baleen is decoupled from the loss of teeth, with a separate morphological and genetic basis." https://t.co/QtfeOGMNEp
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Vestigial teeth. “Along with tooth morphology, it remains unclear whether the tooth buds observed in mysticete embryos represent the first, deciduous dentition, or the second, permanent dentition." https://t.co/QtfeOGMNEp
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Whales. “All frameshift mutations occurred in two enamel related genes, AMBN and ENAM; no frame shifts were observed in the multi-functional DMP1 gene." https://t.co/QtfeOGMNEp