The constancy of the number of cervical vertebrae in mammals is probably the result of selection against associated variations. A survey among patients with and without cervical ribs showed an association between miscarriage and the presence of cervical ribs. This supports the hypothesized selection against variations in cervical vertebral number.
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| http://dx.doi.org/10.1016/j.earlhumdev.2020.105027 | DOI Listing |
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