Can I ask a basic question? When they say there a

Can I ask a basic question? When they say there are 50 people working on the BLA, what are they doing? My limited science experience was working in a wildlife lab in college and the data collected by the PhD candidates was collected and then analyzed by that candidate to prove or disprove his/her hypothesis and then written into a dissertation. Small scale, but it took years. What are these 50 people doing? Who is providing this service? Amarexo?Just trying to understand the process if anyone knows. Thanks.