Experts unexpectedly discovered when studying "Williams Syndrome" that people with musical and mathematical talents are actually caused by abnormal gene arrangements or deletions, and the same genetic disorder can also lead to mental illness such as schizophrenia. Most children with "Williams Syndrome" are born with 20 genes misaligned in number 7 in their bodies. This is true for every 20,000 people worldwide. What is the author most likely to focus on next? ['What is "Williams Syndrome".', 'The significance of chromosome 7 to humans.', 'Typical cases of "Williams syndrome".', 'Genetic disorder and genius.']