Morphologic and histochemical evidence for the occurrence of collagenolysis and for the role of neutrophilic polymorphonuclear leukocytes during cervical dilatation. - Junqueira,L.C.; Zugaib,M.; Montes,G.S.; Toledo,O.M.; Krisztan,S.; Shigihara,K.H. (Am J Obstet Gynecol, 1980)