The abundant protein S-100 positive nerve fibers implies an impact of myelinated nerves in the cervix uteri during pregnancy. The abundant dendritic cells, positive for HLA-DR and S-100, especially at term, indicates a general activation of the immune system until late pregnancy and parturition. The changed occurrence and distribution of immunoreactivity for CGRP, VIP and PHM-27 suggest a release of these neuropeptides until term. The changes in NPY immunoreactivity indicate a release of NPY around parturition.
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