1. 
   Mucus Plug
   A plug of mucus that fills the cervical canal during pregnancy. Discharge of the plug is usually followed by rupture of the membranes and progressive labour.
   Found op http://www.encyclo.co.uk/local/20415
   
   
2. 
   mucus plug
   A plug of mucus which blocks the cervix during pregnancy. It is often released with the onset of labour.
   Found op http://www.babycentre.co.uk/glossary/m/
   
   
3. 
   Mucus Plug
   A small plug of mucus that seals the cervix to protect your baby from infection. During pregnancy, secretions will accumulate and form a mucus plug at the opening of your cervix to protect against infection. The mucus plug will remain at the top of the cervix until just before labor begins. As labor...
   Found op http://www.pregnology.com/AZ/M/7
   
   
4. 
   Mucus plug
   A small plug of mucus that seals the cervix to protect your baby from infection.
   Found op http://www.encyclo.co.uk/local/21460
   
   

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