What is the relationship between Gene and LONDON in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

LONDON (Reuters) - Gene therapy for deafness is moving closer to reality, with new research on Wednesday showing the technique for fixing faulty DNA can improve responses in mice with genetic hearing loss.

Answer: location_of_formation