I am not too worried about LORs from my PI's (both have expressed that writing me strong letters would not be an issue). I was curious if the graduate students I work closely with were able to write letters and how admissions committees look at these letters. Are letters restricted to faculty members? My undergrad has a co-op program and also requires a senior thesis which is where most of my experience is coming from. The two labs I work in are microbiology and neurobiology labs so they are pretty different, but there is some overlap I am finding. I am very interested in these areas (I think I would like to pursue molecular biology). Thanks!