The sentences from the text that best support this inference include:
To find answers, scientists collected blood, hair, skin cell, and saliva samples of people from all over the world.
They then retrieved the DNA from these samples, which is found in the body's 46 chromosomes.
Now that the sequencing is finished, researchers have begun the long process of analyzing the results to find out how these genes function.
The central idea in the story is that the human genome project is a complicated worthwhile investigation into human genes. Scientists involved in the project have already finished mapping, DNA molecules, showing the location of the genes.
