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Ousted South Korean President Park Geun-hye (R) arrives at the prosecutors' office in Seoul Rajon Rondo Authentic Jersey , South Korea, March 21, 2017. Park Geun-hye appeared Tuesday in the prosecutors' office to be questioned over an corruption scandal that led to her impeachment earlier this month. (XinhuaLee Sang-ho)
SEOUL， March 21 (Xinhua) -- South Korean prosecutors ended a marathon interrogation of ousted President Park Geun-hye late on Tuesday night over a corruption scandal that led to her impeachment.

The 14-hour-long questioning came to an end at about 11:40 p.m. local time (1440 GMT) as Park appeared in the Seoul Central District Prosecutors' Office to be questioned over the influence-peddling scandal.

Sohn Bum-kyu， one of Park's legal team， said via text message that it would take about two hours to confirm the testimony Park had given to the prosecutors.

Park is expected to return after midnight to her private home in a southern district of Seoul， where she has stayed since she left the presidential Blue House on March 12.

At present， the prosecutors are reportedly ruling out a possibility to seek to arrest Park.

On March 10， the constitutional court permanently removed Park from office by unanimously upholding the bill to impeach Park that was passed in the parliament on Dec. 9.

Since the passage of the impeachment， Park had vowed to be interrogated by both state and special prosecutors， but she eventually dismissed the requests for questioning by both of them， citing various reasons.

Park had immunity from criminal indictment while in office， but she has lost it as she is now a private civilian. Park became the fourth South Korean former president to be questioned by prosecutors.

During the grilling， prosecutors focused on Park's alleged involvement in charges of bribery， abuse of power and the leakage of state secrets. A total of 13 charges were levied against her.

Park， 65， has been accused of colluding with her decades-long friend Choi Soon-sil， who is now in custody， to receive tens of millions of U.S. dollars in bribes from Samsung Electronics Vice Chairman Lee Jae-yong， the heir apparent of Samsung Group who was also taken into custody.

The kickbacks are suspected of being offered in return for helping Lee inherit the overall management control of the country's biggest family-controlled conglomerate from his ailing father Chairman Lee Kun-hee who has been hospitalized for heart attack for almost three years.

Park was identified as an accomplice to Choi in helping solicit tens of millions of U.S. dollars from scores of large business conglomerates to establish two nonprofit foundations Choi used for personal gains.

Choi has been charged with meddling in state affairs behind the scenes by receiving government documents on a regular basis delivered by one of Park's former presidential secretaries.

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SAN FRANCISCO, March 17 (Xinhua) -- In what could lead to contraceptives that work in both men and women JaVale McGee Authentic Jersey , researchers at University of California, Berkeley, have identified a protein receptor on the surface of sperms that responds to the female sex hormone progesterone.

Describing the receptor as a switch, or a trigger Lance Stephenson Authentic Jersey , the researchers said it is the key to the ""power kick"" needed by a sperm to penetrate and fertilize a human egg.

""If the receptor protein doesn't recognize progesterone, you would be infertile,"" said Melissa Miller, a postdoctoral fellow at both UC Berkeley and University of California Tyson Chandler Authentic Jersey , San Francisco, and the first author of a paper published on Thursday in the ""Fast Release"" issue of the journal Science.

Progesterone is released by the egg or oocyte, the ultimate goal toward which sperm swim. When the sperm gets close to the egg, the hormone activates the receptor and triggers a cascade of changes that make the tail snap like a whip Josh Hart Authentic Jersey , powering the sperm into and hopefully through the cells protecting the egg.

The receptor ""gives us an understanding of another pathway that is involved in human sperm activity,"" Miller said, adding that ""what's really cool is that we have an actual target for unisex contraceptive development.""

""If you can stop progesterone from inducing a power stroke, sperm are not going to be able to reach or penetrate the oocyte Lonzo Ball Authentic Jersey ,"" she explained.

The new discovery has also uncovered a possible source of male infertility, as sperm may be to blame in half of all cases of infertile couples, while doctors currently are unable to determine the cause of nearly 80 percent of all cases of male infertility.

In their lab work, techniques that Polina Lishko Kentavious Caldwell-Pope Authentic Jersey , a UC Berkeley assistant professor of molecular and cell biology, and her colleague Yuriy Kirichok developed over the past five years at UCSF and UC Berkeley were used, allowing them to stick electrodes on a sperm's tail and record its reactions to hormones.

That led to their discovery that a large receptor on sperm tails -- a calcium channel dubbed CatSper -- is activated by progesterone from the egg. Progesterone unlocks the channel gate, letting electrically charged calcium atoms flood into the cell Brandon Ingram Authentic Jersey , leading to a biochemical cascade that readies the sperm cell for its last-ditch effort to fertilize the oocyte.

Miller and Lishko, senior author of the paper, suspected that progesterone was not acting directly on the calcium channel, but on some other receptor that activated the calcium channel.

The team did confirm that progesterone actually binds to a previously mysterious enzyme called ABHD2 Kyle Kuzma Authentic Jersey , which is found at high levels in sperm. Once progesterone binds to the enzyme, which sits on the surface of the sperm, it removes a lipid (2AG) that has been inhibiting the calcium channel. Released of inhibition, CatSper opens the gate to calcium ions and eventual sperm activation.

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