I had applied to many of the internships on the online application through the company, and was called for an informal HR screening interview for two of them. But for the one that I ended up receiving, the hiring manager emailed me directly, asking to set up a phone interview (I was not in the area at the time). We talked for about 45 minutes about general questions, details on my resume, as well as more in depth questions about my laboratory and scientific experience in undergrad and past internships.