Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
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Question: Jan Muhlstein (born 3 July 1949 in Most, Czechoslovakia) is a journalist, German Jewish activist and the former chair of the Union of Progressive Jews in Germany.

Answer: Which language or languages is Jan Mühlstein fluent in?


Question: It was a comfortable sunny Sunday. I was going to meet an old university friend I hadn't seen for years, and was really excited to hear all his news. My train was running a little late, but that was no big problem - I could text him to say I would be delayed. He would understand. But... where was my mobile phone? I had that familiar sinking feeling. Yes, I'd forgotten it at home. No mobile phone. I'm sure I'm not alone in feeling anxious, _ and worried when I don't have my phone with me. In fact, I know I'm not alone: two-thirds of us experience 'nomophobia', the fear of being out of mobile phone contact. That's according to a study from 2012 which surveyed 1,000 people in the UK about their relationship with mobile phones. It says we check our mobile phones 34 times a day, that women are more 'nomophobic'than men, and that 18-24 year-olds are the most likely to suffer fear of being without their mobiles: 77% of them say they are unable to be apart from their phones for more than a few minutes. Do you have nomophobia ? * You never turn your phone off * You obsessively check for texts, missed calls and emails* You always take your phone to the bathroom with you* You never let the battery run out It's funny to think that around 20 years ago the only people with mobile phones would be businessperson carrying their large, plastic 'bricks'. Of course, these days, mobile phones are everywhere. A UN study from this year said mobile phone subscriptions would outnumber people across the world by the end of 2014. And when there are more phones than people in the world, maybe it's time to ask who really is in charge? Are you in control of your phone, or does your phone control you? So, what happened with my university friend? When I arrived a few minutes late he just laughed and said: "You haven't changed at all - still always late!" And we had a great afternoon catching up, full of jokes and stories, with no interruptions and no nagging desire to check my phone. Not having it with me felt strangely liberating. Maybe I'll leave it at home on purpose next time.

Answer: Which word is used to describe old mobile phones according to the passage?


Question: Histone variant H2A.Z-containing nucleosomes exist at most eukaryotic promoters and play important roles in gene transcription and genome stability. The multisubunit nucleosome-remodeling enzyme complex SWR1, conserved from yeast to mammals, catalyzes the ATP-dependent replacement of histone H2A in canonical nucleosomes with H2A.Z. How SWR1 catalyzes the replacement reaction is largely unknown. Here, we determined the crystal structure of the N-terminal region (599-627) of the catalytic subunit Swr1, termed Swr1-Z domain, in complex with the H2A.Z-H2B dimer at 1.78 A resolution. The Swr1-Z domain forms a 310 helix and an irregular chain. A conserved LxxLF motif in the Swr1-Z 310 helix specifically recognizes the C helix of H2A.Z. Our results show that the Swr1-Z domain can deliver the H2A.Z-H2B dimer to the DNA-(H3-H4)2 tetrasome to form the nucleosome by a histone chaperone mechanism.

Answer:
Which protein mediates the replacement of H2A by H2A.Z in the yeast Saccharomyces cerevisiae?