Do letters from engineering professors/faculty satisfy the requirement of LORs from the "natural sciences"? The reason I ask is that I'm a nontrad applicant, recently matriculated from an engineering masters program. It's been several years since I graduated from my undergrad, so most of the professors I knew have either relocated/retired. My undergrad had no premed committee either. Otherwise, I have 2 DO letters (shadowing) and 1 MD letter (3 yrs research). Thank you in advance for your help!