Subjects will undergo a biopsy from the middle of the upper margin of the uterine incision measuring 4 x 2 x 2 cm. This will be performed by the managing doctor at the time of cesarean section after delivery of the baby. Once the tissue is obtained, the site will be closed using sutures similar to the usual closure of the uterus at cesarean section. This biopsy will be taken to the laboratory to test whether the nanovector will increase or decrease contractions in the uterus. Once this test is finished, the tissue will be frozen and test for the absence or presence of the nanovector within the tissue.