Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Ex Input:
Context: Alpha-synuclein(-syn) is the main protein component of Lewy bodies (LBs), that together with nigrostriatal dopamine neuron loss constitute typical pathological hallmarks of Parkinson's disease (PD). Glutamate N-methyl-d-aspartate receptor (NMDAR) abnormalities, peculiarly involving NR2B-containing NMDAR, have been observed in the brain of PD patients and in several experimental models of the disease. Recent findings, indicating that -syn can modulate NMDAR trafficking and function, suggest that this protein may be a pivotal regulator of NMDAR activity. Prompted by these evidences, we used fluorescence immunocytochemistry, western blotting and ratiometric Ca(2+) measurements to investigate whether wild type (wt) or C-terminally truncated -syn can specifically modulate NR2B-containing NMDAR levels, subcellular trafficking and function. In addition, we evaluated whether the exposure of primary cortical neurons to increasing concentrations of rotenone could differentially regulate NR2B levels and cell viability in the presence or in the absence of -syn. Our results indicate that both wt and C-terminally truncated -syn negatively modulate NR2B-containing NMDAR levels, membrane translocation and function. Moreover, we found that absence of -syn abolishes the rotenone-dependent decrease of NR2B levels and reduces neuronal vulnerability in primary cortical neurons. These findings suggest that -syn can modulate neuronal resilience by regulating NR2B-containing NMDAR, whose specific alterations could connect -syn pathology to neuronal degeneration in PD. 
 Question: Which is the primary protein component of Lewy bodies?

Ex Output:
αsyn


Ex Input:
Context: The smallest planet, Mercury, is the planet closest to the Sun. Because Mercury is so close to the Sun, it is difficult to observe from Earth, even with a telescope. However, the Mariner 10 spacecraft, shown in Figure 1.1, visited Mercury from 1974 to 1975. The MESSENGER spacecraft has been studying Mercury in detail since 2005. The craft is currently in orbit around the planet, where it is creating detailed maps. MESSENGER stands for Mercury Surface, Space Environment, Geochemistry and Ranging. (a) Mariner 10 made three flybys of Mercury in 1974 and 1975. (b) A 2008 image of compiled from a flyby by MESSENGER. As Figure 1.2 shows, the surface of Mercury is covered with craters, like Earths Moon. Ancient impact craters means that for billions of years Mercury hasnt changed much geologically. Also, with very little atmosphere, the processes of weathering and erosion do not wear down structures on the planet. Mercury is named for the Roman messenger god, who could run extremely quickly, just as the planet moves very quickly in its orbit around the Sun. A year on Mercury the length of time it takes to orbit the Sun is just 88 Earth days. Despite its very short years, Mercury has very long days. A day is defined as the time it takes a planet to turn on its axis. Mercury rotates slowly on its axis, turning exactly three times for every two times it orbits the Sun. Therefore, each day on Mercury is 57 Earth days long. In other words, on Mercury, a year is only a Mercury day and a half long! Mercury is close to the Sun, so it can get very hot. However, Mercury has virtually no atmosphere, no water to insulate the surface, and it rotates very slowly. For these reasons, temperatures on the surface of Mercury vary widely. In direct sunlight, the surface can be as hot as 427 C (801 F). On the dark side, or in the shadows inside craters, the surface can be as cold as -183 C (-297 F)! Although most of Mercury is extremely dry, scientists think Mercury is covered with craters, like Earths Moon. MESSENGER has taken extremely detailed pictures of the planets surface. there may be a small amount of water in the form of ice at the poles of Mercury, in areas that never receive direct sunlight. Figure 1.3 shows a diagram of Mercurys interior. Mercury is one of the densest planets. Its relatively large, liquid core, made mostly of melted iron, takes up about 42% of the planets volume. 
 Question: the core of mercury is made mostly of melted

Ex Output:
iron


Ex Input:
Context: Doug (Barry Sullivan) and Helen Stilwin (Barbara Stanwyck) head off for a fishing vacation with their son Bobby (Lee Aker). Doug wants to return to beach he visited years before. The family is towing a small trailer with camping gear so they can fish and camp on the isolated beach south of Escondido in Mexico.As they leave drive, they get farther away from towns, services, and civilizations. When they need water for the cars radiator, they can only find a deserted service station. They leave the main road and encounter a police block. After a quick scan of the car, the Mexican authorities let them proceed, with no explanation for why they were stopped. When Helen asks Doug why he didn't push for an explanation, he tells her he didn't want them to look too closely at the car. He didn't want to explain why he was carrying his army pistol. Helen puts the gun in the glove box and they proceed.When they arrive at the beach, it is indeed isolated. An old, rotting jetty emerges far out into the water. As Doug and Helen are getting settled in and relaxing, Bobby climbs out to the jetty's end. Helen is worried the jetty is not safe and frantically calls Bobby back. As he return, his foot slips and is caught between two planks. Doug goes out to free him. As they are walking back over the precarious timbers, a large wave combined with Doug's weight causes the jetty to fall. Doug is trapped on the beach, his foot stuck under a timber too large to move.Helen tries to dig Doug out with a shovel, but the beach is solid rock. She retrieves the car jack and nearly has the large timber raised when the pin in the jack breaks. Doug and Helen decide that with a sturdy rope, she can pull the timber with the car. Helen will have to drive back to the deserted service station to find a rope. They estimate that Helen should have four hours before the rising tide covers Doug completely, threatening to drown him. Bobby stays with Doug and makes him a cup of coffee. Bobby tries unsuccessfully to wave down a fishing boat. When all hope is nearly gone, Doug and Bobby have a serious father and son talk about what should happen if Helen does not return in time.Helen races down the road. When she encounters a Mexican family, she pleads for help or a rope, but they do not understand her poor attempt at Spanish until she is gone. She reaches the service station and breaks into the building and retrieves a rope. As she returns to the car, she is relieved to see Lawson (Ralph Meeker), an American man, suddenly standing by her car. She quickly enlists his help and they head for the beach to save her husband. As they pull away with Lawson in the drivers seat, the camera shows a dead man lying in the bushes.Lawson soon reveals that he has no intention of helping her husband. He is running from the police. He finds the gun in the glove compartment and holds the gun on her while they pass the police. While he is speeding down the rough roads, they have a flat tire. Lawson is unable to find the jack, but manages to drive the car up onto a ramp made of abandoned boards. After he changes the tire, Helen tries to hit him with a tire iron, but he is able to fight her off. He escapes capture again, but this time has to fire the gun at a police car pursuing him. Realizing that she cannot overpower Lawson, Helen begins to bargain with him. Helen promises Lawson her husband's clothes, his identification card, and the car if only Lawson will help free her husband. Finally, she offers him what he really wants: she will go with him after they free his husband. Traveling as couple and with her husband's identification, they will more easily get by the police. She will do anything to save her husband's life.Once they arrive at the beach, the situation is dire. The rising tide 
 Question: Who plays the role 'Bobby'?

Ex Output:

lee aker