During pregnancy, the breast is responsive to a complex interplay of hormones that cause tissue development and enlargement in order to produce milk.

During pregnancy, the cervix is blocked by a special antibacterial mucosal plug, which prevents infection, somewhat similar to its state during the infertile portion of the menstrual cycle.

During pregnancy, the glands and blood vessels in the endometrium further increase in size and number.

During pregnancy in viviparous mammals, endogenous retroviruses ( ERVs ) are activated and produced in high quantities during the implantation of the embryo.

During the early days of pregnancy, the conceptus is mobile, moving about in the uterus until about day 16 when " fixation " occurs.

During menopause, estrone is the predominant circulating estrogen and during pregnancy estriol is the predominant circulating estrogen in terms of serum levels.

During season seven, a pregnancy storyline was written in for the B ' Elanna character.

During pregnancy, all women produce vasopressinase in the placenta, which breaks down ADH.

During pregnancy, even in the absence of preconception cardiovascular abnormality, women with Marfan syndrome are at significant risk of aortic dissection, which is often fatal even when rapidly treated.

During the 1980s, the show incorporated the real-life experiences of the show's cast and crew, including the death of Will Lee ( Mr. Hooper ) and the pregnancy of Sonia Manzano ( Maria ) to address affective concerns.

During pregnancy, testing can be performed on the placenta ( chorionic villus sampling ) or the fluid around the fetus ( amniocentesis ).

During the pregnancy ( usually later in it ), the woman may have glucose ( sugar ) in her blood at a higher than normal level.

* During pregnancy women experience CTS due to hormonal changes ( high progesterone levels ) and water retention ( which swells the synovium ), which are common during pregnancy.

During pregnancy, diabetic retinopathy may also be a problem for women with diabetes.

During her pregnancy with her last child, Marijke Christina, Princess Juliana contracted German measles.

During pregnancy, Bajoran women suffer from uncontrollable bouts of sneezing rather than morning sickness.

During check-ups, women will receive medical information over maternal physiological changes in pregnancy, biological changes, and prenatal nutrition including prenatal vitamins.

During the epidemic in the US between 1962 – 1965, Rubella virus infections during pregnancy were estimated to have caused 30, 000 still births and 20, 000 children to be born impaired or disabled as a result of CRS.

During a hyperemetic pregnancy, many woman complain of excessive saliva and an inability to swallow this saliva.

* During pregnancy

During pregnancy, high circulating concentrations of estrogen increase prolactin levels by 10-to 20-fold.

World Health Organization recommendation on Maternal Supplementation During Pregnancy states that " health benefits are expected for the mother and her developing fetus with little risk of detriment to either, from a daily supplement not exceeding 10, 000IU vitamin A ( 3000mcg RE ) at any time during pregnancy.

During menopause, estrone is the predominant circulating estrogen and during pregnancy estriol is the predominant circulating estrogen in terms of serum levels.

During pregnancy, the uterus presses the navel of the pregnant woman outward, however it usually retracts after birth.

During the day, the guards use the traditional green flag to signal the Loco pilot to depart and the red flag to stop, along with two-way radios.

During the Fort Polk exercise, preliminary interoperability with traditional military radio networks was also demonstrated for LW v0. 6, using a two-way, SINCGARS-compatible gateway radio.

During pregnancy, there is a two-way traffic of immunologically active cell lines through the placenta.

During Motorola's sponsorship of the team in the 1990s, the riders began communicating with the team cars through the use of two-way radios built by Motorola.

During a radio contest, each station attempts to establish two-way contact with other licensed amateur radio stations and exchange information specific to that contest.

During one recent day of driving about Los Angeles there were actually a dozen occasions when oncoming drivers stopped an entire lane of traffic to permit me to pull out of an impossible side street.

During the summer of 1945, a Soviet cipher clerk had reused a one time pad to transmit intelligence traffic.

During the Cold War, Naval Air Station Keflavik played an important role in monitoring marine and submarine traffic from the Norwegian and Greenland Seas into the Atlantic Ocean.

During peak hours, traffic is allowed to use the shoulder as an additional lane.

During this time, enrollment at the small state school swelled ( due in large part to the opening in 1957 of the Mackinac Bridge, linking the Upper and Lower Peninsulas to vehicle traffic ) and as a result, the campus expanded rapidly, roughly to the size it remains to this day.

During the early 1970s, port traffic averaged about 3 million tons a year, compared with an overall capacity of about 3. 8 million tons.

During these hours traffic is at maximum level.

Note: During the 1980s, common control exchanges became stored program control exchanges, using common-channel signaling in which the channels that are used for signaling, whether frequency bands or time slots, are not used for message traffic.

During the robbery, a traffic cop, Hale Keith, was severely wounded when Nelson spotted him, jumped onto a teller's desk, and gunned Keith down through a plate glass window.

During business days in most major cities, traffic congestion reaches great intensity at predictable times of the day due to the large number of vehicles using the road at the same time.

During rush hour, traffic signals are used with green lights to allow one car per blink of the light to proceed on to the freeway.

During the war, troop movements and restrictions on automobile fuel generated a sixfold increase in passenger traffic from the low point of the Great Depression.

During the previous two winters, the GDR had been plagued with power shortages and traffic breakdowns.

During the mid-1990s, when Usenet traffic grew significantly, particularly in academia, the humanities.

During Monzon's fights, Argentina would stand still, cities had no traffic, TV sets and radios were tuned to the fight.

The section of Interstate 40 which runs between Memphis and Nashville is often referred to as the Music Highway During reconstruction, a long section of I-40 through downtown Knoxville near the central Malfunction Junction was completely closed to traffic from May 1, 2008 and not reopened until June 12, 2009 with all traffic redirected via Interstate 640, the northern bypass route.

During the 1990s, businesses in villages south of Hunstanton ( Dersingham, Ingoldisthorpe and Snettisham ) complained of a loss in trade after being bypassed by the A149, which carries heavy Hunstanton-bound traffic.

During the 1930s, the outcry for lighting along State Highway Routes 26 and 25 began to rise as the amount of traffic accidents over the lack of lights.

During the 1840s many of the streets laid out by the town fathers had yet to be opened to traffic.

During 1931, the county government converted the Michigan Central Railroad's defunct rail bridge crossing the Trenton Channel into the Wayne County Bridge for use by vehicular, bike and pedestrian traffic.

During the twentieth century the city's economy experienced a downturn, first due to the replacement of steamboat traffic on the Mississippi River by railroads in the early 1900s, and later due to the exodus of many local industries that had provided a large number of jobs in the area.

During the summer of 1993, the railroad reopened to train traffic as the floods of the midwest affected lines around the Mississippi and Missouri rivers.

During the day, traffic would be stopped every hour, on the hour, and the bridge would open to boat traffic on the waterway for 10 minutes.