Regeneron interview questions

I applied to a position online and I received an email about this position 2-3 weeks later to arrange for a phone interview. After my phone interview I waited for 1.5 more weeks for a phone call requesting a face-to-face interview. The interview was scheduled for 2 weeks later. Everyone I spoke to was very polite and the assistant made sure I had travel plans to go to the interview. She also made sure I was reimbursed for the travel fee. They gave me detailed instructions on what to bring with me for my interview so I was prepared. When I arrived at the building all I had to do was speak to the security guard to get checked-in. The person I spoke with during the phone interview came to pick me up after 30 min ( I was 30 min early) and brought me to his office. After I spoke with him I spoke with another veteran of the company. Then we took a break for lunch where I met other employees who are already in the position I am applying for. Then I met with two RAIIIs for a 2:1 interview. After I met with the HR rep. for a 1:1 interview. My last interview of the day consist of a 4:1 interview where RA IV and up employees interviewed me. The first two 1:1 interview/2:1 was mostly chatting and talking about my background and what my interests are.The interview with the HR rep was 3 simple behavioral questions. The last 4:1 interview consists of a lot of specific and detailed question about ophthalmology. Overall Everyone was very polite and friendly. Everyone greeted each other in the hallways and the environment was very bright.

First was a phone interview with HR rep. and the Director; and passing that I was invited to their office to meet with the HR, Director and the team.