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In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

“We feel a sacred obligation to continue our work,” she said. 
  
 However, the remains that have yet to be identified are the most challenging. Most of the samples are bones, which are some of the most difficult materials to generate DNA profiles from, Mr. Desire said. Compounding the effort is the fact that much of the DNA of Sept. 11 victims was destroyed or degraded because of exposure to fire, heat and jet fuel. 
  
 Though the steps for DNA identification have remained mostly the same over the years, the techniques for extracting and identifying DNA samples have improved. First, the bone must be pulverized though recently, Mr. Desire’s team has been able to apply new technology — ultrasonic ball bearings — to this process, which has resulted in a finer powder. The finer the powder, the more DNA that can be extracted, Mr. Desire said. 
  
 Then, scientists extract DNA, but because the DNA is often so limited, they try to make copies of it by triggering a polymerase chain reaction using an enzyme. In the case of Mr. Johnson, the scientists performed the process three times before they had enough DNA to create a profile. 
  
 Once the DNA profile is generated, the team then compares it to DNA samples. The Medical Examiner’s office has a databank of more than 17,000 reference samples from victims and family members. Mr. Johnson’s DNA sample was compared to a sample from his toothbrush and then confirmed with samples from his parents. 
  
 Mr. Desire said the DNA testing techniques have improved in response to the difficulties in identifying 9/11 victims. The DNA crime lab, part of the medical examiner’s office, also conducts research and development, which has been instrumental in technological advancement, Mr. Desire said. 
  
 “We are far ahead of where we would have been if not for the necessity of making these identifications,” he said. 
  
 For Mr. Johnson’s father, who is a member of the board of the National September 11 Memorial Museum, the identification of his son provides little comfort, he said. Though he said he was grateful that the city had been sensitive and diligent in its work, the news was just another reminder of the pain he and his family have felt for 17 years. 
  
 “His friends reported at his memorial service on the incredible love and support that he gave to them that in a sense went even beyond our understanding of him,” Mr. Johnson said about his son. “He was one of the kindest people that anyone around him had ever known. The pain of losing someone like that was tremendous.” ||||| “We have to break these bone samples down to small pieces to get access to the cells,” Desire said. “Through the years, that process has gotten better and better. We are also using new digestion chemicals to remove the DNA from the fragment.” |||||
Output:
Advances in DNA testing have helped investigators identify the remains of one more victim of the 9/11 attacks—the 1,642nd to be identified, and the first in almost a year. A bone fragment that investigators had attempted to identify several times over the years has been confirmed as belonging to Scott Michael Johnson, a 26-year-old financial analyst who worked on the 89th floor of the World Trade Center's south tower, the New York Daily News reports. He was one of 67 Keefe Bruyette & Woods employees to die that day. The bone fragment was identified with the help of new DNA technology that can identify samples that have degraded in the almost 17 years since the attacks. Mother Ann Johnson, 71, is glad the medical examiner's office kept its promise to never stop trying to identify all 2,753 victims. "Having said that, it's also made me cry and when I told our daughter, we sat there and both cried," she tells the New York Times. "You get pulled right back into it and it also means there’s a finality. Somehow I always thought he would just walk up and say, 'Here I am. I had amnesia.'" (Another victim was identified in August last year, but the man's family chose to withhold his name.)