In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.

Sentence 1:A subsequent report focused on biosecurity , especially the so - called dual - use challenge . Sentence 2:For example , while synthetic biology may lead to more efficient production of medical treatments , it may also lead to synthesis or modification of harmful pathogens ( e.g. , smallpox ) .
for example