Inflammatory cells in cervical tissue from mice that deliver preterm and at term.

<p><b>A-</b> F4/80 staining in cervical tissue. Increased macrophage infiltration (black arrows) was observed in the cervix of mice that deliver preterm antepartum and intrapartum. In contrast no macrophages were observed in the cervix of mice that deliver at term antepartum and intrapartum. Original magnification is ×20. <b>B-</b> Gr-1 staining in cervical tissue. No neutrophil infiltration was observed at preterm or term cervical samples. Original magnification is ×20. 4 slides per animal were stained and 6–8 animals were studied in each group.